how to use a plastic wood filler?

If you’re trying to fill in a large gap or crack, you’ll want to use a plastic wood filler. It’s less messy than applying spackle and dries faster.

We’ll tell you everything you need to know about using plastic wood filler in this article including how long it takes for the material to dry and how strong it is once hardened.

How do you use plastic wood fillers for large gaps?

If you need to fill a large gap, such as along a window or door frame, you’ll want to use the plastic wood filler in a different way.

When it comes to large gaps, it’s best not to apply the filler directly from the tube. Instead, squeeze out some more putty and apply it with a putty knife. The goal here is to fill all of the space between two surfaces without getting any on either surface (which would ruin your project).

Apply as much of this material as necessary until there are no holes left—you want every inch covered by plastic wood filler!

Once you’ve applied all of your plastic wood filler and allowed it enough time for drying (usually overnight), begin sanding all surfaces once again using fine-grit sandpaper. Then repeat these steps until any small pieces or pockets that remain are filled completely with this wonderful substance—and voila! You’re ready for painting!

How long does it take plastic wood filler to dry?

Plastic wood filler is a great alternative to wood filler, as it dries faster and is less likely to shrink. It also has greater flexibility than traditional wood filler, which means you can use it on curved surfaces.

However, since plastic wood filler dries faster than traditional fillers, be sure to keep your project in mind while working with the product. The longer you wait before finishing your project after applying the plastic filler, the better!

Plastic wood fillers take 24 hours to dry completely before sanding and finishing them with paint or stain. This is something to keep in mind when deciding how long you should leave your project untouched before moving on to its next step

Does plastic wood filler Harden?

Yes, plastic wood filler hardens. In fact, it dries by cross-linking the polymer chains together. This makes the material stronger and more resistant to cracking or breaking.

Can you sand plastic wood filler?

You may be wondering if you can sand plastic wood filler. The short answer is: no, you probably shouldn’t. Plastic wood fillers are meant to dry and harden on their own, so sanding them would only wash away the paste and make it more difficult for the patch to set properly.

That said, if your repair job isn’t going well or there’s a spot where the filler hasn’t dried properly because of an air leak (if this occurs), then yes—sand away!

If you do choose to sand down your plastic wood filler patch, use a fine-grit orbital sander with 120-grit paper or higher and proceed very carefully so as not to gouge into the surrounding material like drywall plasterboard etcetera).

It’s also worth noting that this will increase the drying time considerably due to all those little bits of paper getting mixed up with each other and clogging up any kind of venting system built into

How strong is plastic wood filler?

Plastic wood filler is strong and can hold a lot of weight. The tensile strength of the plastic wood filler is approximately 30% higher than plywood at both the short-term and long-term limits.

This means that it will withstand more pressure than plywood, which makes it perfect for repairs on your home or other structures.

How big of a gap can you fill with wood filler?

That depends on how big the gap is. How much wood filler you need will depend on the size of your gap and how many layers of filler you have to use.

If you are filling a small crack, then one layer should be enough to fill it up completely. However, if you have a large open space or a huge hole in your floorboards, for example, then there are two things that need to happen: (1) You may have to use more than one layer of filler; (2) You will want to use as much filler as possible so that all trace of damage disappears!

To help spread out this mess so that it doesn’t go everywhere when spread by hand or with a putty knife (which I recommend), I like putting down newspapers or paper towels underneath where I am working so that any bits fall onto them instead of my carpeting below—or even worse—my feet!

Why is my wood filler not drying?

  • It is too hot in the room.
  • The wood filler is not dry enough to sand.
  • The wood filler is too thick, or was applied incorrectly.

How long should you leave wood filler before sanding?

The amount of time you leave wood filler before sanding depends on the type of filler you are using and the size of the gap.

For porous fillers such as PVA, I would recommend leaving it for 30 minutes. For more absorbent fillers such as polyfiller or wood putty, let it sit for six hours before sanding.

It’s worth noting that different manufacturers have different recommendations: Some say 24 hours while others suggest only two hours.

When in doubt about how long to wait before sanding, err on longer rather than shorter—it’s better to wait for an extra hour or two than rush through a project!


When you put this all together, it’s easy to see how plastic wood fillers can help you fill larger gaps or cracks in your wall. It’s also important to remember that you want to let the product dry before sanding it down again.

This will ensure that no moisture remains in your freshly patched area and allows for a smooth finish once finished.

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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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