is wood filler durable?

Wood filler is a great way to fix holes in your wood trim, cabinets, or furniture. It’s easy to use and inexpensive, so it’s no surprise that many people choose to use wood filler for their home projects.

While it does come with some pros and cons (as does anything), we’re here today to discuss whether or not wood filler is durable enough for long-term use.

How long does wood filler last?

The answer to this question depends on the type of wood filler you use and the type of surface you are filling. While most commonly used for exterior repairs, some types of wood filler can be used indoors as well.

Wood Filler Types

There are two main types of wood filler: epoxy and polyester resin. Epoxy is a two-part liquid compound that hardens after it has been mixed together and applied to a surface (it takes between 24 hours and 48 hours).

Polyester resin is a single-component product that will cure within 24 hours after application (and may require several days or weeks before it fully cures).

It typically comes in either an aerosol spray or liquid form; both types must be mixed before use (usually by adding water).

Is wood filler permanent?

The answer is simple: it depends. It all depends on the type of wood filler you use. Some types are more durable than others, and some are less durable than others.

If you’re wondering whether your wood filler will last, think about what kind of material you’re using as a base for the filler. If it’s painted or stained, then chances are good that it’ll stick around for quite a while before starting to crack or peel off—but if your base material is bare wood (or even just not painted), then there’s a much higher chance that your wood filler won’t stay put forever.

Does wood filler get as hard as wood?

Yes, wood filler is durable and strong. Wood filler is a resin-based product that hardens when you apply it to the wood. Wood filler is made from plastic resins and other ingredients, such as waxes or pigments.

Resin is essentially a polymer: long chains of molecules that are chemically bonded together to form a solid material with unique properties (such as hardness).

When the resin hardens, it forms chemical bonds with the wood around it and becomes part of your project — just like an actual piece of wood!

What works better than wood filler?

You can use wood putty instead of wood filler. Wood putty is more durable, and you can fill larger holes with it.

Wood putty is also more versatile than wood filler because you can sand it to a smooth finish that looks good on the surface of your project.

Does wood filler crack?

To answer this question, we must first understand what wood filler is and how it works. Wood filler is a putty-like material that you use to fill holes in your wood before sanding and painting. It’s made of sawdust, flour, glue, and linseed oil (or similar products).

The problem with too much wood filler is that it can crack under pressure or when dry. This means that if you apply too much of the product to one area, it will start to crack as soon as you apply pressure to it or let it dry out completely–and once cracked once, it will probably continue cracking every time there’s a little bit of pressure applied to the hole being filled.

Even more importantly: if you apply too much wood filler then let the excess dry before sanding away some of its thickness–that excess will also be subject to cracking because all of those cracks have been shrunken down by drying out in one place instead across an entire surface area!

How long does wood filler take to harden?

Wood filler takes 24-48 hours to harden. This can vary depending on the brand, so you may want to test them out before using them for an important job.

Once it has hardened, the wood filler will be harder than your original piece of wood and should not crack or break easily. However, if you wait too long (we’re talking weeks), it can get too hard and become difficult to sand down.

To determine if your wood filler is ready for sanding, run a fingernail across the surface of your repaired area and check that there are no cracks in the surface after 24 hours have passed since application of glue and before further drying occurs (around 72 hours). If all’s well and good, go ahead with sanding!

How thick can you apply wood filler?

How much wood filler to use depends on the size of the crack. The rule of thumb is to apply thin layers, let dry, and then sand down. Repeat this process until you’re happy with the result.

You can use a putty knife or spreader to apply the wood filler, but be aware that if you get too much on your blade it will be difficult to clean off later.

If you prefer not to use tools at all you can always just stir up some filler in your hand and paint it on directly (make sure there are no sharp edges!).

After cleaning up any excess with a damp cloth, let your repair dry for 24 hours before painting over it—and remember: there is no shame in using more than one layer!

Can you paint over wood filler?

Yes, you can paint over wood filler.

To get the best results, use a latex-based primer and topcoat paint. The primer should be applied to the entire area that’s been filled with wood filler. Then, sand down the primer with fine grit sandpaper before applying your topcoat of choice.


We hope this article has helped you understand the durability of wood filler. As you can see, it is a great product to use when working on your home and can be very effective at repairing any problems that arise.

Just make sure you follow all of the directions on the package when using it so that your project doesn’t end up being ruined!

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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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