
There are several ways to cover nail holes in PVC trim. One option is to use a PVC TrimWelder Nail Eraser, an eraser wax crayon that can fill in nail holes without the need for painting. For painted PVC trim, it is recommended to use PVC TrimWelder Fast Cure for best results. Other options include using caulk, epoxy, spackling compound, or a putty knife. Some people also use automotive Bondo, a two-part epoxy putty, or Bond-N-Fill, which requires sanding and changes the surface texture of the boards.
| Characteristics | Values |
|---|---|
| Materials | Epoxy putty, joint compound, spackling compound, caulk, Bondo body filler, PVC TrimWelder Nail Eraser PVC Grade Eraser Wax Crayon, Bond-N-Fill, white Cor-tex plugs |
| Tools | Putty knife, sanding sponge, sandpaper, acetone |
| Techniques | Fill holes completely, leaving them slightly crowned to sand after the epoxy sets; smooth with denatured alcohol before setting hard; fill holes with joint compound, leaving it protruding, then sand with a sponge after it dries |
| Considerations | PVC is a breeding ground for mildew growth; cut edges should be hidden or finished as they are more porous than the factory surface and prone to collecting dirt and grime |
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What You'll Learn

Using caulk
Caulk is a common material used to fill nail holes in PVC trim. However, it is important to note that caulk can shrink and turn grey over time, which may be undesirable for some projects. If you are using caulk to fill nail holes in PVC trim, follow these steps:
First, ensure that you are using the appropriate type of caulk for your project. Acrylic caulk is a good option, as it can be painted with acrylic paint to match the colour of your PVC trim. You can also use ordinary caulk and paint it with a colour that matches your trim.
Next, prepare the nail holes for filling. Make sure the holes are clean and free of debris. If the holes are large, you may need to use a putty knife or your fingertips to fill them, but if they are small, you can simply apply the caulk directly into the hole with a caulking gun or a finger.
When filling the holes, completely fill them and leave them slightly crowned so that you can sand them smooth after the caulk sets. You can use a putty knife or your fingertips to smooth out the caulk and ensure that it is level with the surface of the trim.
After the caulk has set, you can sand it down with 100 to 120 grit sandpaper using light pressure. This will ensure that the filled holes are smooth and level with the surface of the trim.
Finally, you can paint over the caulked areas if desired or necessary to match the colour of your PVC trim. Keep in mind that caulk can shrink over time, so it is important to monitor the filled holes and re-caulk if necessary.
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Using epoxy
Epoxy is a recommended filler for covering nail holes in PVC trim. It is a type of adhesive or glue that bonds well with plastic and is extremely durable and waterproof. It is also easy to sand down and doesn't shrink or expand, making it ideal for filling nail holes.
To use epoxy to cover nail holes in PVC trim, follow these steps:
- Choose the right epoxy: Select a two-part epoxy PVC nail hole filler that is specifically designed to be used with PVC. You can also use a basic two-part epoxy, but make sure it bonds well with plastic. Try to find an epoxy that matches the color of your PVC trim, especially if you don't plan to paint over it.
- Prepare the epoxy: In a plastic container, mix together the two parts of the epoxy following the manufacturer's instructions. Mix until you achieve the ideal consistency.
- Fill the nail holes: Use your fingers or a small putty knife to fill the nail holes with the prepared epoxy. Make sure to fill the holes completely, leaving a bit of a crown that you can sand off later.
- Sand the surface: Allow the epoxy to set and cure. Once it is dry, use 100 to 120 grit sandpaper with light pressure to sand the epoxy until it is smooth and flush with the PVC trim.
- Protect yourself: When handling uncured epoxy, wear gloves to prevent it from bonding with your skin. Also, wear a dust mask when sanding the cured epoxy to avoid inhaling any dust particles.
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Using a crayon stick
Filling nail holes in PVC trim can be done in several ways, one of which is by using a crayon stick. The crayon-like filler is intended for PVC and can be used to fill nail holes up to 1/8 of an inch in size.
The PVC TrimWelder Nail Eraser PVC Grade Eraser Wax Crayon is a product that can be used to fill in nail holes in unpainted PVC trim. It is packaged in a convenient blister pack for secure holding and easy access. To use this product, scrub the tip of the crayon back and forth over the hole until it is filled. Then, wipe the PVC trim board clean with a dry cloth or paper towel to ensure a smooth finish.
Some customers have found the PVC TrimWelder Nail Eraser easy to use, with one mentioning it only takes about 5 minutes to fill all holes. Another customer noted that it created a seamless finish. However, other customers have found the product hard to use, with one mentioning that it is not worth the money or time as it is difficult to putty nail holes with.
The crayon filler is also advertised as having a special blend of fillers to resist yellowing and has been lab-tested for hole retention on cellular PVC at 140°F.
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Using joint compound
While there are many ways to cover nail holes in PVC trim, joint compound is a popular method. This method has been used for the last 10 years or so by a DIYer on their own house and rental properties. Here is a step-by-step guide on how to use joint compound to cover nail holes in PVC trim:
First, you will need to gather your materials. You will need joint compound, a sanding sponge or sandpaper, and optionally, a putty knife. It is recommended to use a sanding sponge with a grit between 100 and 120.
Next, you will need to prepare the joint compound. Follow the instructions on the packaging to mix the compound appropriately.
Once the joint compound is ready, it is time to start filling the nail holes. Using your finger or a putty knife, apply a small amount of the joint compound into and onto the hole, leaving it protruding slightly. It is important to completely fill the nail hole to ensure a smooth finish.
After applying the joint compound, let it dry completely. This may take several hours or overnight, depending on the size of the application and the instructions on your specific joint compound.
Once the joint compound is dry, it is time to sand it down. Using your sanding sponge or sandpaper, lightly sand the area until the joint compound is level with the surrounding surface. Two or three swipes with the sanding sponge should be enough to make it perfectly flat.
Finally, you can paint over the area if desired. The nail holes will be almost impossible to find once painted.
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Using acrylic-based spackling compound
Filling nail holes in PVC trim can be done in a variety of ways, and one method that has proven effective is the use of an acrylic-based spackling compound. This approach offers a simple and straightforward solution without the need for exotic or complicated mixtures.
Acrylic-based spackling compounds are a great choice because they are designed for both interior and exterior use, ensuring versatility for your project needs. The process begins by applying the compound directly to the nail hole, ensuring it is completely filled. It is recommended to leave the compound slightly raised above the surface, creating a crowned effect, which can then be sanded down once it has dried. This step ensures a smooth and level finish.
For sanding, it is advised to use fine-grit sandpaper, ranging from 100 to 120 grit. Light pressure is key to achieving a smooth surface without damaging the surrounding PVC trim. The sandpaper will help you achieve a consistent and even texture, blending the filled area seamlessly with the rest of the trim.
While the acrylic-based spackling compound serves as the primary filler, you can also utilize acrylic caulk to address any gaps or cracks that may be present around the nail holes. Acrylic caulk is a suitable companion to the spackling compound, ensuring a cohesive and aesthetically pleasing result.
It is worth noting that some individuals have expressed concerns about PVC being a breeding ground for mildew growth, particularly in regions like New England. This may influence the long-term appearance and maintenance of your PVC trim. Therefore, it is essential to consider the specific climate and environmental conditions of your location when deciding on the best approach for covering nail holes.
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Frequently asked questions
There are several ways to cover nail holes in PVC trim. You can use epoxy putty, a crayon-like filler stick, caulk, or spackling compound. If you are planning to paint the PVC trim, it is recommended to use PVC TrimWelder Fast Cure for the best results.
To cover nail holes in PVC trim with epoxy putty, completely fill the nail holes, leaving them slightly crowned so you can sand the epoxy down after it sets. You can use a putty knife or your fingertips to smooth it out. For sanding, use 100 to 120 grit sandpaper with light pressure.
The easiest way to cover nail holes in PVC trim is to use a PVC TrimWelder Nail Eraser. This product comes in the form of a crayon and can be used by scrubbing the tip back and forth over the hole until it is filled. Then, wipe the surface clean with a cloth or paper towel to ensure a smooth finish.











































