Is wood filler permanent?

Wood filler is a great way to fill holes, cracks, and other imperfections in wood. It’s easy to use and comes in many different brands and types.

But how long does it last? Is it strong enough for everyday use? And can you paint it? We answer these questions and more here!

How long does wood filler last?

It depends on whether you’re using the wood filler to fix a small crack or gouge in your wood, or if you are using it to fill in dings and dents on furniture. It also depends on how well you apply it.

If you have a small crack to fix, and properly apply the filler with no gaps between the flooring and the bed of filler, then it will be permanent.

If there are large gaps between where your flooring meets your walls/wallpaper/etc., then these need to be filled first before applying any kind of paint or stain over them (so that they can adhere).

If not filled properly before painting, then when water hits those areas later, they will leak through

Is wood filler durable?

While wood filler is strong, it’s not indestructible. If you need to repair a piece of furniture, wood filler will work great.

But if you want to make sure that your house doesn’t fall apart in the next hurricane or earthquake (and really, who doesn’t?), use concrete grout instead.

Does wood filler crack over time?

It’s not uncommon for wood filler to crack over time. Sometimes this is because of water damage or insects, but most often it’s due to the material itself.

Wood filler isn’t made of stone or concrete—it’s made out of something much softer and more malleable, which makes it prone to cracking as it dries.

The best way to prevent your wood filler from cracking is by following these tips:

  • Use a sponge brush instead of your finger when applying your first coat so that you get an even layer on both sides.
  • Wait 24 hours before applying another coat and let each coat dry completely before putting anything heavy on top of the wood surface (like furniture).
  • Don’t use too much filler at once because that can cause more bubbles than necessary on top of your piece!

Does wood filler get as hard as wood?

No. Wood filler and wood putty are not as strong as wood, and the difference in strength can be significant.

Wood putty is much weaker than wood filler because it contains a lot of binding agents that make the product more malleable, but also less sturdy.

It’s best to avoid using this kind of filler in areas where you will need to apply pressure on it or place heavy objects on top of it (like furniture). Instead, use a stronger material like epoxy or polyurethane glue for these purposes!

Can I paint over wood filler?

Since wood filler acts as a base for your paint, you can apply another coat of paint over it. First, be sure to apply a primer that will seal the wood filler and help prevent peeling and cracking.

Then use quality paint in either latex or oil-based form. Avoid using water-based paints on wood filler because they don’t dry quickly enough or hold up well to moisture and weather conditions.

If you plan on doing any additional repairs and painting later, wait at least two weeks before applying new coats of paint so that your first coat has had time to cure completely (the drying process).

Should I use wood putty or wood filler?

Sometimes, you’ll want to fill a small hole with wood putty. Wood putty is usually used for filling in nail holes or gaps between boards. It will dry quickly, so it’s best to use it on small patches that you can sand down right away.

Wood filler is more versatile than wood putty and can be used for larger projects like filling cracks or holes in your wallboard.

The consistency of this type of filler is thicker than what you’d find in a tube; it comes as a powder that you add water to before applying it directly onto your project surface.

When choosing this type of product over its counterpart (wood putty), be aware that it may take longer for the product to dry completely after application.

How thick can wood filler be applied?

There is no specific answer to this question. Wood filler has a consistency similar to peanut butter, so it’s easy to control the thickness when applying it with your finger or a putty knife.

However, if you’re using some sort of tool for spreading the wood filler quickly over larger areas, you may need to go back over and even out any thicker layers with your fingertip later on.

The best way to determine how much wood filler you’ll need for each project is by testing out different applications until you find one that works well enough for your taste.

Is wood filler strong enough to screw into?

This is a common misconception. While wood filler will fill the space between two pieces of wood, it’s not strong enough to be used as structural support.

If you try to screw it into wood filler, it can crack or cause the wood to split. For example, if you’re using a screwdriver and hammer to install new floorboards and drive screws through your old floorboards into the subfloor below them, don’t use wood filler as an intermediary between them!

If there are cracks in your subfloor that need to be filled before installation begins (which there probably are), then use some good ol’ duct tape instead of trying this trickery with some crumbly stuff that isn’t actually strong enough for anything but filling tiny holes in walls.


Wood filler is a must-have for any home repair and remodeling project. It’s easy to use, affordable, and strong enough for almost any application.

Plus, it dries quickly so you can get back to work on time! With all of these benefits in mind, it’s hard not to love wood filler.

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Martin Flood

Martin Flood has been working in the construction industry for over 20 years as a general contractor with expertise in remodeling projects that are large or small. He has furthered his career by specializing in epoxy resin flooring, providing excellent service to both commercial and residential clients. Martin’s experience enables him to offer professional advice on how to choose the right type of project based on your needs and budget.

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