Have you ever tried to remove veneer glue from wood or other surfaces and found it to be a frustratingly stubborn task? Maybe you’ve tried scraping, sanding, or even using a solvent, but the glue just won’t budge. Well, fear not! In this article, we will provide you with tips and tricks on how to effectively remove veneer glue from various surfaces. We’ll discuss the tools you’ll need, the steps to take, and the precautions to consider before diving in. Remove your worries and get ready to say goodbye to that stubborn glue once and for all!
Why is Veneer Glue so Stubborn?
Veneer glue is a type of adhesive that is specifically formulated to create a strong, long-lasting bond between thin sheets of veneer and the surface of a substrate, which is typically wood. This type of glue is so stubborn because it is designed to withstand the stresses and strains that occur when the veneer is subjected to normal wear and tear, as well as being exposed to changes in temperature and humidity.
Since veneer glue is formulated to be so strong, it can be very difficult to remove once it has been applied to a surface. The glue can seep into the pores of the wood, which can make it even more difficult to remove without damaging the wood. It is important to use the right tools and techniques when attempting to remove veneer glue.
Some of the tools that can be used when removing veneer glue include scrapers, putty knives, sandpaper, and heat guns. However, exercising caution is also important because glue solvents can be toxic and should only be used in well-ventilated areas while wearing protective gear.
Interestingly, the technique for removing veneer glue differs depending on the surface it is applied to. When removing veneer glue from wood, the process typically involves scraping, sanding, and using a heat gun or glue solvent to remove any remaining residue. However, when removing veneer glue from concrete or metal, a different process is often required, with a focus on scraping, heating, and using a solvent.
Ultimately, the key to successfully removing veneer glue is to be patient, diligent, and prepared. Ensuring that you have all of the necessary tools and protective gear beforehand, and being meticulous in your approach to removing the glue, will go a long way towards making the process as smooth as possible.
If you also need to remove other types of glue, like industrial or contact glue, foam glue or hot glue, or even glue dots from glass or inspection sticker glue from windshield, make sure to read our related articles for more tips and tricks on how to safely remove them .
Tools You Need
Essential Tools for Removing Veneer Glue
Removing veneer glue can be a tricky task, but with the right tools, it can be done with ease. Before you start removing veneer glue, make sure to gather all the tools needed to ensure that you can work efficiently and effectively. Having the right tools will make this task less daunting. Below are the essential tools needed to remove veneer glue from different surfaces such as wood, concrete, and metal. If you want to know how to remove contact glue, visit our article /how-to-remove-contact-glue/.
Scrapers and/or putty knives
Scrapers and putty knives are essential tools when it comes to removing stubborn veneer glue from wood. These tools come in various shapes and sizes, and choosing the right one will depend on the size and shape of the area you need to work on. For smaller areas, a putty knife might be appropriate, while a scraper might be better suited to larger areas.
Scrapers and putty knives should be made of durable materials and have a sharp edge to effectively scrape off the glue. When using these tools, it’s essential to apply adequate pressure to ensure that you remove as much glue as possible without damaging the wood. Hold the scraper or putty knife at a 45-degree angle, and begin scraping off the glue with firm, even strokes. Ensure that you scrape in the direction of the wood grain to avoid damaging it.
If you don’t have scrapers or putty knives, some household tools can work in a pinch. For instance, old credit cards or plastic rulers can be utilized to scrape off the glue. However, these tools might not be as effective as scrapers or putty knives.
Using a scraper or putty knife is the first step in removing veneer glue from wood. But, some glue might stick to the wood even after scraping. In such cases, sandpaper comes in handy. The finer the grit of sandpaper, the gentler it will be on the wood. Sanding in the opposite direction from the wood grain can cause scratches, so you should be careful while sanding.
In the next section, we will look at another essential tool – heat guns.
How to remove glue down wood floor
Sandpaper
When it comes to removing veneer glue, sandpaper is an essential tool to have in your arsenal. It is particularly useful in removing any remaining glue residue after scrapping and sanding. By sanding the surface area, you can ensure that the final product is smooth and free of any remaining glue.
Using sandpaper requires some level of finesse, particularly when working with wood. The type of sandpaper you use can make all the difference in achieving the best result. For instance, a lower grit (like 40-80 grit) is perfect for removing stubborn glue residue, while a higher grit (like 120-220 grit) is ideal for sanding the surface smooth after removing the glue.
Pro tip: When using sandpaper, it’s best to sand in the direction of the grain to avoid damaging the wood fibers. Remember to always wear protective gear like gloves and goggles to protect your hands and eyes from any debris that may arise during the sanding process.
If you’re having trouble removing veneer glue residue, consider wet sanding. Wet sanding involves soaking the sandpaper in water to create a slurry that helps to remove the glue more effectively. This method improves the performance of the sandpaper and prevents it from clogging up with glue residue.
Caution: Be careful not to oversand and damage the wood. It’s easy to go overboard with sanding, so take breaks to check the progress every few passes. Once you have achieved the desired smoothness, use a clean cloth to wipe off any remaining sandpaper dust.
Using sandpaper is a crucial step in removing veneer glue residue. By choosing the right grit, sanding in the direction of the wood grain, and taking precautions, you can ensure that the surface area is smooth and ready for a new finish.
Heat gun
When it comes to removing veneer glue from wood or other surfaces, using a heat gun can be an effective method. The heat gun works by softening the glue, making it easier to scrape off or dissolve with solvents. Here are a few tips for using a heat gun to remove veneer glue:
1. Safety first! Before using a heat gun, it’s important to put on protective gear, such as heat-resistant gloves and safety glasses. And make sure you’re working in a well-ventilated area to avoid breathing in fumes.
2. Start on a low setting. Heat guns typically have multiple temperature settings, so it’s best to start on the lowest setting and work your way up as needed. Hold the heat gun a few inches away from the surface and move it around in circular motions.
3. Be patient. It can take some time for the heat gun to soften the glue, so don’t rush the process. Keep the heat gun moving and be careful not to overheat the surface or cause any damage.
4. Scrape off the glue. Use a scraper or putty knife to gently scrape off the softened glue. Be careful not to damage the surface underneath.
5. Follow up with solvents or sandpaper. Depending on the amount of glue left behind, you may need to use a glue solvent or sandpaper to remove any remaining residue. Check out our article on how to remove glue dots from glass for tips on using solvents effectively.
By following these tips, you can effectively use a heat gun to remove stubborn veneer glue. Just remember to take your time and prioritize safety while working.
Glue solvents
One of the most effective ways to remove veneer glue is to use strong glue solvents. These solvents work by breaking down the adhesive bond between the glue and the wood or surface it has bonded with.
There are several types of glue solvents available in the market, each with its own unique properties and strengths. The following table lists some of the most commonly used glue solvents:
| Glue Solvent | Description | Best Used For |
|---|---|---|
| Acetone | A strong and fast-acting solvent that evaporates quickly | Removing glue from metal surfaces or plastic phone cases. Learn how to get glue off phone case |
| Mineral spirits | A mild solvent that works well for removing glue residue | Removing glue from wood and other porous surfaces |
| Goo Gone | A commercial glue remover that is specifically designed for removing adhesive residue | Removing stubborn glue from various surfaces |
| Vinegar | A natural and safe solvent that can be used to remove glue residue | Removing glue from wood surfaces. Learn how to get hot glue off a table |
| Isopropyl alcohol | A strong and fast-acting solvent that can dissolve and remove glue | Removing glue from various surfaces including hands, metal, and plastic. Learn how to get foam glue off hands, and how to get spray glue off hands |
| WD-40 | A light and effective solvent that can loosen and dissolve adhesives and glues | Removing glue from various surfaces including glass and metal. Learn how to remove inspection sticker glue from windshield |
| Nail polish remover | Contains acetone which can dissolve and remove stubborn glue | Removing glue from various surfaces including desks. Learn how to get nail glue off desk |
Before using any of these solvents, it’s important to wear proper protective gear such as gloves and eye protection. It’s also essential to read and follow the instructions on the label of the solvent carefully to ensure safe and effective use.
Using glue solvents can be an effective way to remove stubborn veneer glue but it’s important to test it on a small, inconspicuous area first to ensure it doesn’t cause any damage or discoloration to the surface.
Protective gear
It is important to protect yourself when removing veneer glue, as some methods can be messy and potentially hazardous. Here are some protective gear items you should have on-hand:
- Gloves: Wearing gloves will protect your hands from any potential harm due to the chemicals or glue solvent used in the process. It is advisable to wear rubber gloves as they provide maximum protection and are resistant to chemical damage.
- Goggles: When using a heat gun or scraping away glue, small particles may become airborne and can easily enter your eyes. Wearing goggles will prevent any damage to your eyes caused by these particles.
- Respirator mask: When using glue solvents or sanding away glue residue, fumes and dust particles may become airborne. Wearing a respirator mask will protect your lungs from inhaling these substances.
- Long-sleeved shirt and pants: It is important to take extra precautions to prevent any skin from coming into contact with the glue or chemicals. Wearing long-sleeved shirts and pants will protect your skin from any potential harm.
Remember to always use protective gear when removing veneer glue to prevent any potential harm to yourself or damage to your surroundings.
How to Remove Veneer Glue from Wood
Removing veneer glue from wood can be a challenging task, as the glue is specifically designed to adhere firmly to the wood’s surface. However, it’s not an impossible feat. With the right tools and techniques, you can remove veneer glue from your woodwork while preserving the material’s integrity. So, if you’re wondering how to get rid of that pesky veneer glue from your wooden surface, read on to learn the step-by-step process.
Step 1: Scrape off as much glue as possible with a scraper or putty knife.
When it comes to removing veneer glue, the first step is always to scrape off as much of the glue as possible using a scraper or putty knife. This may seem like a simple task, but there are a few important things to keep in mind to ensure that you do the job right.
Tools Needed:
To scrape off the veneer glue properly, you need to have the right tools at hand. Here are a few tools that you might need:
| Tools | Description |
| Scraper | A scraper is a hand-held tool with a flat blade that is used to remove veneers and other difficult materials. |
| Putty knife | A putty knife is similar to a scraper, but it has a wider blade that is specifically designed for applying and removing putty. |
How to Scrape off the Veneer Glue:
Once you have the necessary tools ready, take the following steps to scrape off the veneer glue:
- Hold the scraper or putty knife at a 45-degree angle to the surface of the wood or concrete.
- Apply moderate pressure to the scraper or putty knife and scrape off as much of the glue as possible from the surface.
- Be sure to scrape off all the glue residue from the surface to give a clean slate to work with during the next step of the process.
- For larger surfaces, you may need to break up the area into smaller sections to make sure you don’t miss any spots.
- Keep the scraper or putty knife clean by wiping it with a rag periodically to avoid dragging glue residue over fresh areas of the surface.
Remember, this step can be hard work, especially if the glue has hardened over time. It’s essential to be patient and take your time to get as much of the glue off the surface as possible. You don’t want to leave any residue behind, as this will hinder the effectiveness of the next steps in the process.
Step 2: Sand the area to remove any remaining glue residue.
After scraping off as much glue as possible, the next step is to sand the area to remove any remaining residue. Sanding will help to eliminate the glue that’s still clinging to the surface, leaving behind a clean and smooth surface. To sand effectively, you’ll need to gather some tools and take some precautions.
Tools You’ll Need:
| Tool | Purpose |
|---|---|
| Sandpaper (medium to coarse grit) | To remove glue residue from the surface |
| Sanding block or sanding sponge | To hold the sandpaper and sand the surface evenly |
| Vacuum cleaner or damp cloth | To clean up the sawdust that accumulates during the sanding process |
Precautions to Take:
Before you start sanding, make sure to take these precautions to ensure a safe and successful experience.
- Wear protective gear: To protect yourself from sawdust and other debris, wear a dust mask, safety glasses, and gloves.
- Choose the right sandpaper: A medium to coarse grit sandpaper is ideal for removing glue residue. Use a higher grit sandpaper for a smoother finish.
- Sand evenly: Use a sanding block or sanding sponge to hold the sandpaper and apply even pressure. Sand in the direction of the grain to avoid scratches and unevenness.
- Clean up as you go: Vacuum the area frequently or wipe the surface with a damp cloth to remove sawdust and debris as you work.
- Check your progress: Keep sanding until no residue is visible. Use a flashlight or angled light to check for any spots you might have missed.
By following these precautions and selecting the correct tools, sanding to remove remaining glue residue can be a fairly simple and easy process. Sanding will give the surface a clean and smooth finish, making it ready for further steps to eliminate the stubborn veneer glue.
Step 3: Use a heat gun to loosen stubborn glue.
One effective way to remove stubborn veneer glue from wood is by using a heat gun. The heat softens the glue, making it easier to scrape off. Here’s how to do it:
| Tools you need: | Heat gun | Scraper or putty knife | Protective gear |
|---|---|---|---|
| Steps: | 1. Put on protective gear such as gloves and safety glasses to avoid burns and debris. | 2. Heat a small area of the glue around the edges for a few seconds. | 3. Use a scraper or putty knife to lift the veneer gently. Be careful not to scrape too much of the wood. |
| 4. Move the heat gun along the edge of the lifted veneer to soften the glue underneath. | 5. Gently scrape off the loosened glue. | 6. Repeat the process on the next section of the veneer. |
Keep in mind that a heat gun can be dangerous if not used properly. Always wear protective gear and be careful not to direct the gun towards your body or anything flammable. Use the lowest heat setting possible to avoid scorching the wood. If you’re unsure about using a heat gun, consider using another method to remove the glue.
Step 4: Use a glue solvent to further break down the glue and remove it from the wood.
After scraping and sanding the wood surface, it’s time to use a glue solvent to further break down the stubborn glue and remove it completely. There are various types of glue solvents available in the market which can help you to remove the veneer glue from wood. Here’s a table that highlights some of the most commonly used glue solvents and their properties:
| Glue Solvent | Properties |
|---|---|
| Acetone | Fast evaporating, flammable, strong odor |
| Mineral spirits | Low odor, slower drying, less flammable than acetone |
| D-limonene | Natural solvent made from citrus, less toxic, pleasant scent |
| Methyl ethyl ketone (MEK) | Fast evaporating, strong odor, flammable, can dissolve some plastics |
| Xylene | Strong solvent, flammable, evaporates slower than some other solvents |
Acetone is a common solvent used for removing glue as it’s fast-evaporating and can dissolve most types of glue. However, it’s highly flammable and has a strong odor, so it’s important to use it in a well-ventilated area and with protective gear such as gloves and a mask. Mineral spirits is also a good option as it’s less flammable and has a low odor, but it may take longer to dissolve the glue.
D-limonene is a natural solvent extracted from citrus fruits and is less toxic than other solvents. It has a pleasant scent and can be a good option for those who are sensitive to strong chemical odors. Methyl ethyl ketone (MEK) is another strong solvent that can dissolve some plastics, so it’s important to avoid using it on plastic surfaces. It has a strong odor and is highly flammable, so it’s important to use protective gear and work in a well-ventilated area.
Xylene is a strong solvent that’s effective for removing stubborn glue, but it’s highly flammable and evaporates slower than some other solvents. It’s important to use it in a well-ventilated area and with protective gear.
When using a glue solvent, it’s important to follow the manufacturer’s instructions carefully and use it in a well-ventilated area with protective gear. Apply the solvent onto the glue residue and let it sit for a few minutes to dissolve the glue. Use a scraper or putty knife to gently remove the glue residue. Repeat the process if necessary until the surface is free of glue residue.
How to Remove Veneer Glue from Concrete or Metal
If you’ve ever had to deal with veneer glue on concrete or metal surfaces, you know how stubborn it can be. Removing it may seem like a daunting task, but with the right tools and techniques, it can be done. In this section, we’ll walk you through the steps for safely and effectively removing veneer glue from concrete or metal surfaces. So put on your protective gear and let’s get started.
Step 1: Scrape off as much glue as possible with a scraper or putty knife.
When it comes to removing veneer glue, the first step is to scrape off as much of the glue as possible with a scraper or putty knife. This will help to get rid of any loose or flaky bits of glue that may be on the surface. However, it’s important to use the right tools for the job. Here are some tips to keep in mind:
| Tool | Pros | Cons |
|---|---|---|
| Scraper | Effective at removing large sections of glue | May damage the surface if not used carefully |
| Putty knife | Good for getting into tight spaces | May not be as effective as a scraper for larger sections of glue |
Whichever tool you choose to use, it’s important to work slowly and carefully. Use a light touch to avoid damaging the surface of the wood or other materials you’re working with. If the glue is particularly stubborn, you may need to use a combination of tools to get rid of it completely.
Once you have removed as much of the glue as possible with your scraper or putty knife, it’s time to move on to the next step. It’s important to complete each step thoroughly, as this will help to ensure that you get the best possible results in the end. With patience and persistence, you can successfully remove even the toughest veneer glue from any surface.
Step 2: Use a heat gun to loosen the glue.
When it comes to removing stubborn veneer glue, using a heat gun is an effective method. The heat from the gun helps to loosen the adhesive, making it easier to scrape off. However, it is important to use caution when using a heat gun to avoid damage to the wood or injury.
Here are the steps to follow when using a heat gun to remove veneer glue:
| Step | Instruction |
| 1 | Put on protective gear such as gloves, safety glasses, and a dust mask. |
| 2 | Plug in the heat gun and turn it on to a medium setting. |
| 3 | Aim the heat gun at the area where the glue is located and hold it a few inches away from the surface. Slowly move the heat gun back and forth over the area. |
| 4 | Observe the adhesive to ensure that it is loosening from the wood. Be careful not to overheat the area, as this can cause damage to the wood or surrounding material. |
| 5 | Use a scraper or putty knife to gently remove the loosened glue. Be sure to work carefully and slowly so as not to damage the wood. If the glue starts to cool and harden, reheat the area with the heat gun to soften it again. |
| 6 | Repeat the process of heating and scraping until all of the adhesive has been removed. |
| 7 | After the glue has been removed, sand the area to smooth out any rough spots or remaining residue. |
Remember to always follow the safety guidelines when using a heat gun, as it can be a dangerous tool. Protecting yourself with gear such as gloves, safety glasses, and a dust mask can help prevent injuries while doing this type of work. Additionally, make sure not to overheat the area and cause irreparable damage to the wood. With these precautions in mind, using a heat gun can be a highly effective way to remove stubborn veneer glue.
Step 3: Apply a glue solvent to break down the glue and remove it from the surface.
After scraping off as much glue as possible and using a heat gun to loosen stubborn glue, the next step in removing veneer glue from concrete or metal is to apply a glue solvent to break down the remaining glue and remove it from the surface.
Here are the steps to follow when using a glue solvent:
- Choose the right solvent: There are different types of glue solvents available in the market. It is important to choose the right solvent based on the glue used, the type of surface, and the safety precautions mentioned on the label.
- Apply the solvent: Pour or spray the solvent onto the glue residue, and allow it to sit for a few minutes. Follow the manufacturer’s instructions carefully, as leaving the solvent on for too long may damage the surface beneath the glue.
- Scrub the surface: Once the glue has been broken down by the solvent, scrub the surface with a scraper or stiff-bristled brush to remove any remaining residue.
- Clean the surface: After removing the glue residue, clean the surface with warm water and a cleaning solution to remove any remaining solvent and residue.
- Repeat if necessary: If there is still glue residue left on the surface, repeat the process until the surface is completely clean.
- Dispose of the waste: Remember to dispose of the waste materials, such as a used solvent, rags, and brushes, safely according to the local regulations.
It is important to wear protective gear such as gloves, goggles, and a respirator when using a glue solvent to avoid inhalation or contact with the skin. Additionally, work in a well-ventilated area and avoid open flames or sparks, as many solvents are flammable.
Step 4: Use sandpaper to remove any remaining residue.
After using a heat gun and glue solvents, you may still find traces of veneer glue left behind on your concrete or metal surface. This is where sandpaper comes in handy as the final step to completely remove any remaining residue.
To begin, choose a coarse sandpaper with a grit of around 60 to 80. Place the sandpaper on the surface with the glue residue and start rubbing it in a back-and-forth motion. Apply pressure as needed, but be careful not to damage the underlying surface.
As you continue sanding, switch to a finer grit sandpaper with a grit of around 100 to 120. Repeat the same back-and-forth motion, and keep the pressure moderate. Gradually move to even finer grit sandpaper, with 220 and 320 grit to ensure a smooth and even surface.
Note: It’s crucial to protect your eyes, skin, and lungs during the sanding process. Wear goggles, gloves, and a mask to avoid inhaling the dust and debris.
Once you’re satisfied with the smoothness of the surface, you can wipe it clean with a damp cloth and let it dry. Congratulations! You’ve successfully removed all the veneer glue from your concrete or metal surface.
Precautions to Take When Removing Veneer Glue
When removing veneer glue from wood, concrete, or metal, it’s essential to take proper precautions. Here are some tips to help you stay safe during the removal process:
Wear Protective Gear: When removing veneer glue, you should wear appropriate protective gear. This may include gloves, safety glasses, and a mask or respirator to protect your skin, eyes, and lungs from the fumes and dust that may be released during the process.
Avoid Open Flames: As some methods to remove veneer glue use heat, it’s essential to keep away from open flames or other sources of ignition, as glue solvents and heat guns may produce harmful fumes or sparks.
Use Proper Ventilation: Make sure to work in a well-ventilated area to avoid inhaling harmful fumes. Open windows and doors or use a fan to circulate the air around the area. If working in an enclosed space, consider using a respirator rated for the chemicals you are using.
Read and Follow the Instructions: Before using a glue solvent, heat gun, or any other tools, make sure to read the instructions carefully. Improper use of these tools can cause harm to yourself or your project. It’s also important to follow safety guidelines and warnings listed on glue solvent or heat gun packaging.
Dispose of Waste Properly: After removing veneer glue, it’s important to dispose of any waste or debris properly. Depending on the type of glue solvent used, it may be considered hazardous waste and require special disposal methods. Check with your local authorities or disposal services for specific guidance in your area.
By following these precautions, you can safely remove veneer glue without risking your health or safety.
Conclusion
In conclusion, removing veneer glue can be a challenging task, but with the right tools and techniques, it can be done effectively. It is important to have the proper protective gear at hand, such as gloves and a mask, to prevent any potential health hazards from glue solvents or dust from sanding.
Scraping off as much glue as possible with a scraper or putty knife is the first step in the removal process. This helps to remove the bulk of the glue, making it easier to remove any remaining residue in the later steps. Sanding the area to remove any remaining glue residue is also crucial, as it helps to ensure a smooth and even surface for any further work needed.
Using a heat gun to loosen stubborn glue is a great way to tackle any areas that are proving to be difficult to remove. However, it is important to be careful when using a heat gun, as overheating can damage the wood or surface that you are working on.
Finally, applying a glue solvent to break down the glue and remove it from the wood or surface is a key part of the removal process. There are many different types of glue solvents available on the market, each with its own strengths and weaknesses. It is important to choose the right solvent for your particular job, taking into account the type of glue that was used and the wood or surface that it is attached to.
By following the steps outlined in this article, you should be able to effectively remove veneer glue from any surface. Remember to take the necessary precautions and use the appropriate tools and solvents for the job at hand. With a little patience and effort, you will be able to produce a clean and smooth surface, ready for any further work that you require.
Frequently Asked Questions
1. Can I remove veneer glue without damaging the original wood surface?
Yes, by following the steps in this article and being patient, you can remove veneer glue without causing damage to the original wood surface.
2. Do I need all the tools mentioned in the article?
No, you might not need all the mentioned tools, but they will make the job easier and faster.
3. Can I use a regular household cleaner to remove veneer glue?
No, a regular household cleaner will not effectively remove veneer glue. Instead, use a glue solvent specifically designed for this purpose.
4. Can I use a hair dryer instead of a heat gun?
No, a hair dryer won’t get hot enough to loosen the glue effectively. A heat gun is essential for this job.
5. Can I remove veneer glue from metal using a glue solvent?
Yes, a glue solvent can be used on metal, but it’s best to test it on a small, inconspicuous area first to check for any adverse reactions.
6. How long should I wait before using a scraper or putty knife?
Wait until the glue has cooled and hardened, which usually takes around 30 minutes to an hour after application.
7. Are there any safety precautions I should take when using a heat gun?
Yes, wear protective gear such as gloves and eye protection, and be sure to keep the heat gun moving to prevent scorching the wood or accidental burning.
8. Can I use a power sander to remove glue residue?
While a power sander can be used, be cautious not to damage the underlying wood surface. It’s best to start with a lower grit sandpaper and work your way up gradually.
9. How long should I let the glue solvent sit before removing the glue?
Read the manufacturer’s instructions to determine the recommended waiting time for the specific glue solvent you are using. In general, you should wait at least 10-15 minutes before scraping or wiping off the glue.
10. Can I reuse a scraper or putty knife after using it to remove veneer glue?
Yes, you can reuse a scraper or putty knife after removing veneer glue, but be sure to clean it thoroughly with a solvent or soap and water to remove any glue residue before using it again.