do you need a hardener for wood filler?

When it comes to woodworking, you have a lot of options. You can use hand tools, power tools, or even a combination of both. But one thing that is essential to every project is wood filler.

Just like it sounds, wood filler is used to fill cracks and holes in wood surfaces so they look smooth and seamless again after they’ve been damaged or broken during construction or remodeling projects.

Can you mix hardener with wood filler?

You can absolutely mix wood filler and hardener. And it’s a good idea to do so! When you mix the two, it will dry faster, harder, and more evenly.

It also won’t smell as much when you apply it (if at all).

What is the purpose of non hardening wood filler?

There are many reasons why you may want to use non hardening wood filler. Perhaps the most common reason is that you have small gaps in your woodwork, such as between two pieces of furniture or a cupboard door and frame.

You can fill these small gaps with a non-hardening type of wood filler so that they are smooth and flush with the surrounding area.

Another reason to use non-hardening types of wood filler is if you need to strengthen your woodwork.

For example, if there’s a crack in your floorboards or some other part of your home made from wood, then this can be repaired using a non-hardening type of filler which will strengthen it by filling any cracks as well as any holes that might be present in order for this repair job to be successful without having any issues later on down the line when it comes into contact with water again!

Does wood filler strengthen wood?

While wood filler is not designed to strengthen wood, it does provide a more durable surface for the wood. Wood filler is used to fill cracks and holes in your piece of furniture or other items that need repair. It can also be used on its own as a decorative finish on an unfinished project.

Why does my wood filler keep cracking?

Cracks in wood filler are usually the result of one of three things:

  • Your filler is too thick. If you apply it too thickly, it will crack as the wood dries out. The same thing happens if your filler isn’t mixed well or applied over an area with a lot of imperfections.
  • Your filler is too thin. When applied too thinly, the dry-time on your wood glue will be increased and you will also be more likely to experience shrinkage cracking as well as other kinds of failure like mold growth or warping due to uneven drying between different areas

How do you stop wood filler from cracking?

  • If you’re using a wood filler that has a hardener, wait until it’s completely dry before using your project.
  • If you’re using a wood filler with a catalyst or resin, follow the instructions on the package. These products will generally cure faster than those without catalysts and resins.
  • Finally, if you’re using one of these products in combination with another—for example, if you’re applying both resins and catalysts—follow the curing times listed for each product separately.

Which is better wood putty or wood filler?

The answer to this question depends on the type of project you’re working on. Wood putty is a flexible material, which means it’s ideal for filling holes or gaps in a piece of wood furniture or other objects.

Wood filler is more durable, so it tends to be better suited for repairing cracks in woodwork that have already been damaged.

How big of a gap can wood filler fill?

The answer to this question depends on the size of the gap you want to fill. You can fill gaps up to 1/2″ wide, 1/2″ deep, and 1/2″ tall with wood filler.

If you have a larger gap (or more than one) that needs filling, consider using something like spackle instead.

It’s an alternative product that works better for bigger repairs and can be smoothed over after it dries with sandpaper or a sander.

How do you seal wood filler?

As you might expect, there are different types of sealers designed to be used on wood. Try not to use polyurethane or water-based sealer; these will not hold up well against water and may be more likely to peel off over time.

Instead, look for a polyurethane-based product that is specifically made for filling in holes, nail holes, etc.

Here’s another tip: when applying the finish coat over the wood filler, make sure you don’t apply too much pressure with your brush or roller!

If you press down too hard on top of the material it could cause peeling later on down the road.

If this happens and you notice that little bubbles are forming under your surface coat (or any other kind of peeling), then grab some sandpaper and lightly sand off those areas until they smooth out again


Wood filler is a great tool for filling cracks, holes, and gaps in your wood. However, there are times when you need it hardened or stiffen up so that it can be used as a permanent fix for an area of your house.

This article has given you some information about what hardener is used for and how to use it with your filler to get the best results possible!

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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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