
Filling nail holes on inside trim is an essential step to achieving a professional and polished finish. While leaving nail holes unfilled may seem like a convenient option, it can result in noticeable dimples once the paint dries. To avoid this issue, it is recommended to fill the nail holes with suitable materials such as lightweight spackle, wood filler, or putty. However, it's important to be cautious when using putty, as it can sometimes result in indentations or noticeable remnants. For a flawless finish, some people opt for finishing plaster compound, which effectively prevents shrinkage and cracking. Additionally, products like 3M's patch plus primer and Sherwin Williams' shrink-free spackling are recommended for their effectiveness and ease of use.
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What You'll Learn

Lightweight spackle
When using lightweight spackle, the first fill can be done quickly with your finger. After 20 minutes, any excess can be cleaned off with a damp sponge. A second coat can be applied to fill any indents, and after another 20 minutes, it can be gently sponged off. After an hour, the surface can be sanded if needed.
Some popular brands of lightweight spackle include DAP Fast 'n Final, Drydex, and Dynamic Dyna Pro Patch. Drydex goes on pink and dries white, while Dyna Patch Pro is white both before and after drying. Dyna Patch Pro is also known for its quick drying time.
While lightweight spackle is effective for covering nail holes, it may not completely make the holes disappear, especially for larger holes. In some cases, a second coat of regular spackle may be needed to achieve a completely smooth finish.
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Finishing plaster compound
Filling nail holes is a simple project that can help your work look truly professional. The best way to fill finishing nail holes on door and floor trim is to use a lightweight filler compound, such as a finishing plaster compound.
When filling nail holes with finishing plaster compound, it is important to fill high and sand until it is very finely proud. This will ensure that the compound is level with the surrounding trim and provide a smooth finish.
It is also important to consider the type of wood filler to use when filling nail holes. There are two main types of wood fillers: water-based fillers and solvent-based fillers. Water-based wood fillers are adequate for most interior applications as they are easy to smooth on and clean up. Solvent-based fillers, on the other hand, are sticky and oily and can be difficult to clean up if they dry. They are also more difficult to sand down, so it is important to apply them sparingly.
When filling nail holes with finishing plaster compound, it is also possible to use a putty knife to create a flat finished surface. Simply scoop up a small amount of the compound with the edge of the knife, press it into the hole, and smooth off the excess.
Overall, finishing plaster compound is an effective and reliable way to fill nail holes in trim. It provides a flawless and professional finish, and is easy to use and sand down.
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Water-based wood filler
When applying water-based filler, use your finger to press the filler into the hole, leaving a slight, smooth ridge over the area. Keep a damp cloth nearby to wipe off any filler drying on your finger. Avoid pressing excess, partially dried filler into the holes as it may not adhere to the wood's surface effectively. For deeper or larger holes, use a putty knife to scoop up the filler and press it into the hole, then smooth off any excess.
Water-based fillers dry quickly, so close the lid on the filler between applications. After about 15 minutes, you can sand off any crumbles and protrusions with your finger or a clean cotton glove.
While caulk can be used to fill nail holes, it tends to be messier and shrinks more than wood filler. Caulk also cannot be sanded smooth. If you do use caulk, ensure it is labelled as "paintable" and avoid leaving smears on the wood surface.
When filling nail holes, it is important to hide the means of attachment by filling the holes before painting or staining the trim. This will give your project a clean, professional appearance.
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Solvent-based wood filler
Solvent-based fillers are sticky and oily, and difficult to clean up if allowed to dry. They take about an hour to dry, and the clean-up process involves using acetone or turpentine. They are also pricier than water-based fillers.
When using solvent-based fillers, it is important to apply them sparingly as they are difficult to sand down when applied thickly. For wood trim that will be painted, any colour of wood filler can be used. However, for pre-finished trim or trim that will be finished with a stain and/or clear sealer, it is important to select a colour-matched filler that blends with the natural colour of the wood.
When applying solvent-based wood filler, it is best to wear latex or nitrile gloves as it is difficult to clean from your fingers. It is also important to close the lid on the wood filler between applications as it hardens quickly.
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Rock-hard putty
Solvent-based wood fillers are ideal for filling nail holes on interior trim as they dry rock-hard, providing a stronger hold than water-based fillers. Water-based fillers are crumbly and tend to shrink, leaving indentations on the wood.
Solvent-based fillers are sticky and oily, making them difficult to clean up once dried. They are also challenging to sand down, so it is best to apply them sparingly. If you are painting over the trim, you can use any colour filler. However, if you are finishing the trim with a stain or clear sealer, choose a colour-matched filler that blends with the natural colour of the wood.
When filling nail holes with solvent-based filler, it is recommended to wear latex or nitrile gloves as it can be difficult to clean from your fingers. Keep the lid on the filler between applications, as it hardens quickly. Even a minute or two is enough for the filler to start drying, forming a hard film on top that cannot be used.
For deeper or larger holes, a putty knife is better than using your finger, as it can fill a larger area and create a flat finished surface. Scoop up a small amount of filler with the knife, press it into the hole, and smooth off any excess.
Some specific products that can be used for filling nail holes on interior trim include:
- Sherwin shrink-free spackle
- Crawfords vinyl spackle
- Elmers Wood Putty
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Frequently asked questions
The best way to fill nail holes on inside trim is to use a lightweight spackle or wood filler. First, fill the holes with your finger. After 20 minutes, clean off the excess with a damp sponge. After another 15 minutes, apply a second coat to fill any indents and gently sponge off the excess after 20 minutes. After an hour, sand the area if needed.
Products that can be used to fill nail holes on inside trim include 3M's Patch Plus Primer, Sherwin Williams' shrink-free spackling, and Elmer's Carpenter's Wood Filler.
To fill nail holes on inside trim without repainting, you can use crayons or fill sticks. Softening the crayon or fill stick with a lighter and applying it to the nail hole.











































