is exterior wood filler waterproof?

This is a common question for homeowners and contractors alike. The answer is yes, but it depends on the type of wood filler you use and how it’s applied. Here’s everything you need to know about using exterior wood filler:

How long does wood filler last outside?

When it comes to exterior wood filler, the answer is simple: it depends. The longevity of exterior wood filler depends on a number of factors, including where you live (where in the world), how often you use your boat or patio furniture, what type of wood filler you choose, and other environmental factors.

When used indoors or in well-protected areas like garages and basements, most exterior wood fillers will last for years—even decades—without fading or flaking off.

But when exposed to outdoor elements such as sunburned skin; rainwater; wind; cold temperatures; snowfall etc., even the best products will eventually start to fade away after a few years.

Can you use wood filler on exterior?

You can use wood filler on interior walls and floors because it is not waterproof, but it is not recommended for exterior applications.

Wood filler is not UV resistant, which means that the color will fade over time. If you need to repair holes in your wooden deck or balcony, you should use a more durable product such as marine epoxy.

What is a good wood filler for exterior use?

It’s important to choose the right type of wood filler when applying it to your project. While there are many different types of fillers, some work better than others depending on what you’re trying to do.

For example, if you want to fill cracks in your wood siding or decking, it’s important that they’re waterproof so they don’t fall apart over time.

If you’re looking for an exterior-grade putty that can withstand moisture and humidity but still maintain its shape, then Bondo might be right up your alley!

What to use to fill holes in exterior wood?

If you want to fill a hole in your exterior wood, there are a few things to keep in mind. First, you will need to ensure that the material you use is waterproof and durable.

You don’t want it to crack or wear away over time, especially since this is material that has been left exposed to the elements for some time now.

Second, you’ll need something that has enough body and adhesive qualities so that it can hold its own upon drying and curing.

Lastly, consider whether or not this project would require any sort of cosmetic properties once dry: for example if filling an old nail hole might lead people to believe there was never any damage done here at all!

Does wood filler get as hard as wood?

It depends on the type of wood filler you use. Not all are created equal, and some are better than others in terms of durability and waterproofing ability.

Some exterior wood fillers are more waterproof than others; some have a better resistance to rot; some won’t crack as easily when exposed to moisture.

Before you start applying your wood filler, make sure you’ve chosen the right type for your project.

What’s the difference between wood putty and wood filler?

With so many different options available, it can be difficult to know what product you need. Here’s a quick rundown of some key differences:

  • Wood putty is thinner than wood filler and easier to sand down after drying. Because it’s more flexible than wood filler, it’s also more difficult to apply evenly.
  • Wood filler dries harder and can withstand wear better than wood putty—but because its consistency is so much thicker, it doesn’t blend as seamlessly into damaged areas as you might like when patching up holes or cracks in your wood surfaces.

Is DAP wood filler waterproof?

Yes, DAP wood filler is waterproof. It is not recommended for use on wood that will be exposed to water, but it can be used if the wood is already wet.

If you’re wondering whether DAP’s waterproof exterior wood filler should be used on dry or wet surfaces, remember that this product can be used for interior and exterior projects of all kinds and does not require painting after application.

Can you use wood filler on rotted wood?

This is a great question, and it’s one that I’ve been asked many times. The short answer to this question is no—you cannot use wood filler on rotted wood. Why? Because if the wood is rotten, it will not hold the filler.

The long answer: If a piece of wood has rotted away, you can’t fill it because there’s nothing there to fill! But if you have just cracks in your wood or soft spots that need filling, then yes! You can use exterior wood filler on them with no problem at all.


As you can see, it is important to choose the right wood filler for your project. Exterior wood filler is a great choice because it is waterproof and mold resistant.

This makes it an ideal option for outdoor projects such as decks, fences, siding, and more!

Photo of author

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.

Leave a Comment