Are you searching for a reliable exterior wood filler that can stand up to the elements, repair minor superficial damage and restore your deck’s original beauty?

Look no further, we’ve got your solution. This post is about exterior wood fillers. We will learn what they are, why we need them, and how to choose one for your project.

Whether you’re an experienced woodworker or just starting out with DIY projects, there’s something here for everyone. Let’s get started on finding the best exterior wood filler for decks!

Our Top Picks

Best Exterior Wood Filler for Decks

  1. Bondo All-Purpose PuttyBest wood filler for outdoor use
  2. Elmer’s E892Best Stainable Wood Filler
  3. Abatron Wood Epoxy 2 kitBest exterior epoxy wood filler
  4. Minwax 13617000Best Wood Putty for Decks
  5. Pc Products- 163337Best wood filler for pressure treated deck
  6. Gorks GoodFillaBest Wood Fillers for big jobs
  7. Famo Latex Waterproof wood filler for outside deck
  8. Elmer’s E855 Carpenter Wood FillerBest for small jobs
  9. DAP Inc 16Oz Latex Plastic Wood FillerBest Exterior Wood filler

Best Wood Filler for Deck Cracks Review

When finding the best wood fillers for exterior decks, we took into account all of the critical factors, from type to durability. We also read real customer testimonials to ensure that these deck wood repair products are highly popular.

1. Best wood filler for deck boards– Bondo All-Purpose Putty

Bondo All-Purpose Putty, Designed for Interior and Exterior...
  • Two-part filler bonds to broad range of surfaces for permanent, non-shrink repairs
  • Cures fast; sandable in 15 minutes for fast same-day repairs
  • Light gray when mixed, helping blend with surfaces for consistent appearance

We start our list of the best outdoor wood filler for decks with a bang. Bondo wood filler is a professional strength, versatile filler for repairing interior and exterior wood surfaces around the home.

This fast-curing two-part filler allows you to make high-quality, long-lasting repairs to metal, masonry, concrete, painted wood, plastic, drywall, and more.

This filler is temperature and hardener proportion sensitive – the warmer the air temperature, the harder and the faster the cure. Note that you must always mix and apply with a plastic spreader and wear disposable gloves.

While this deck wood filler is fairly thick, it can still flow a little until it sets, so you may need to form a “dam” of sorts to keep it from migrating for a few minutes.

More so, when mixing it, follow directions and scoop the desired quantity out, don’t mix it in the can.

Don’t overdo the hardener, and if your first batch still hardens too quickly, reduce the amount of hardener used, per the instructions.

What We Liked Most

  • Dries quickly and is hard.
  • It’s waterproof
  • Wood filler for outdoors and indoors

What Could Be Improved

  • It’s not good on softwoods like plywood
  • The hardener that comes with the putty is too small; you might need to buy an extra tube to match the putty in the can.

2. Stainable wood filler for deck– Elmer’s E892

Elmer's E892 Stainable Wood Filler 32 oz
  • Contains real wood fibers for superior sanding, staining and painting
  • Resists shrinking and cracking
  • Firmly holds screws and nails

Elmer’s Carpenter’s is a stainable wood filler that is designed for interior and exterior surfaces. It contains actual wood fibers with little or low VOCs, which is good for the environment.

These are some of the best wood fillers work for filling holes and gouges in the wood. Typical uses are for filling dents and holes in furniture, baseboards, molding, and kitchen cabinets.

This wood filler takes time to dry, but it can be sanded by hand or with a high-speed sanding tool once dry. It sturdily holds nails and screws and resists cracking and shrinking over time.

Note that this wood filler is non-structural, so it shouldn’t be subject to critical stress.

What We Liked Most

  • Contains fibers for superior sanding, staining, and painting
  • Firmly holds screws and nails
  • It is solvent-free
  • Best for interior and exterior use
  • Has an unlimited shelf life

What Could Be Improved

  • Takes a while to dry, so thicker repairs take time and can be a bit messy.
  • Comes half full.

3. Best wood epoxy for deck repair – Abatron Wood Epoxy 2 kit

Abatron WoodEpox Kit - 12 oz - 2-Part Structural Epoxy...
  • REPAIR DAMAGED WOOD: Fills and rebuilds missing sections to help restore windows, doors, trim, columns, posts, and other elements. Permanently repairs damage caused by weather, moisture, age, and pests.
  • EASY TO USE: Our wood epoxy has a 20-30 minute pot life (working time) and can be mixed and applied by hand. It can be painted, stained, drilled, carved, sawed, nailed, planed, sanded, and routed, just like natural wood.
  • GREENGUARD CERTIFIED: This product contains almost no VOCs (volatile organic compounds) and does not have water or solvents. It has a low odor and is a clean, safe wood repair solution for both the user and the environment.

Abatron epoxy wood filler is available in a two-part epoxy paste, a 32 oz epoxy filler container, and the other a 32 oz hardener. This particular brand of epoxy fillers has a fast-drying time, and it’s easy to work with.

When mixing wood epoxy for deck repair, wear disposable gloves. This exterior epoxy wood filler turns pale beige when everything is mixed in together, doesn’t drip, and cures in about 60 minutes.

The Abatron outdoor wood filler epoxy works well to fill large voids, and it’s easy to shape to fill a crack effectively. It’s expensive compared to other wood fillers, but its ability to work well stands out, making it the best wood repair epoxy.

What We Liked Most

  • Contains no VOC’s or Noxious OdorsLong-lasting repairs
  • Bonds permanently to wood and other surfaces.
  • Perfect for rotted wood
  • Temperature-resistant
  • It can be cleaned easily with acetone

What Could Be Improved

  • Takes a longer time to cure or dry
  • It’s not good on softwoods like plywood

4. Best Wood Putty for Decks– Minwax 13617000

Minwax 13617000 Wood Putty, 3.75 oz, Walnut, 3 Ounce
  • Fills nail holes and covers other minor imperfections in bare, painted, stained, and finished wood
  • Color-matched to Minwax wood finish stains
  • Easy to use, no sanding necessary

Minwax Wood Putty is a non-hardening pre-mixed putty that repairs small holes and covers other minor imperfections in painted, stained, and finished wood.

It qualified to our list of the best wood fillers because it’s a user-friendly product that’s perfect for DIYers who don’t have the patience for lengthy procedures.

You don’t have to sand this outdoor wood putty once it dries, as it will naturally blend right into your rotted wood.

What We Liked Most

  • Has No VOCs and contains zero toxic ingredients.
  • The deck wood crack filler doesn’t split, no matter the weather conditions.
  • Reconstitutes when you add water.
  • Doesn’t require sanding.

What Could Be Improved

  • It’s only suitable for small repairs
  • It has a slow drying

5. Best wood filler for pressure treated deck – PC Products- 163337

PC Products PC-Woody Wood Repair Epoxy Paste, Two-Part 12 oz...
5,167 Reviews
PC Products PC-Woody Wood Repair Epoxy Paste, Two-Part 12 oz...
  • Two-part epoxy paste to replace missing or rotted wood is resistant to dry rot, UV light, fresh and salt water
  • Can be used in indoor and outdoor applications with an application temperature range of 35 to 115 degrees F and a service temperature range of -20 to 200 degrees F
  • High tack helps reduce drips and sags while hardening

PC-Woody is a Two-part epoxy paste that is used to fill holes and gaps in damaged or decaying wood decks.

This wood filler for pressure-treated lumber has an easy-to-mix ratio. Simply mix equal parts of the resin and the hardener in a plastic or metal container, then apply them to your project.

It is stronger than most wood meaning it offers a permanent solution for deck cracks. The filler is also waterproof, making it a great way to fix things like decks and docks that need to be able to stand up against the elements.

Not only that, this wood filler for pressure-treated wood demonstrates the ability to withstand the effects of UV light.

The product works on all types of wood, including treated lumber and pressure-treated lumber (PTL), redwood, cedar, plywood, pine, spruce, fir and other varieties. It also provides an excellent base for paints or stains to adhere to.

These epoxy paste products can be used indoors as well as outdoors on wood, fiberglass & metal.

This epoxy is made from real wood and has many of its qualities. The PC-Woody formulation is a good way to do large projects. It takes longer, so you have more time to modify some sections while working.

What We Liked Most

  • Both indoor and outdoor wood filler.
  • The high tack helps reduce drips and sags while hardening
  • It can be painted, stained, and machined after being fully cured
  • Has excellent resistance to all weather elements

What Could Be Improved

  • It takes time to set up before you can mold it
  • It doesn’t work well in small gaps
  • It doesn’t bond to wax paper, Teflon, Polyethylene, and some other plastics.

6. Best Wood Fillers for big jobs– Gorks GoodFilla Wood Filler

Water-Based Wood & Grain Filler - Base/Neutral - 8 oz By...
  • ⚒️ HIGH QUALITY & MONEY SAVING: Save time and money with this wood filler that does not shrink, sink, or crack, and has excellent adhesion. Only need to apply once, and it flawlessly accepts any finish or stain! In fact, this product can be mixed with any pigment, tint, stain or dye.
  • ⚒️ DESIGNED FOR PROFESSIONAL WOODWORKERS: This is the most innovative, easy-to-use, water-based wood filler in the WORLD. Designed for professional woodworkers but perfect for your everyday DIYer, too.
  • ⚒️ HARDY & CONSISTENT: As any woodworker will tell you, they throw hardened wood filler out all the time. But Goodfilla offers an unlimited shelf life since it reconstitutes with water and is freeze-thaw stable.

This is the most innovative, easy-to-use, water-based wood filler. It’s designed for professional woodworkers but perfect for your everyday DIYer, too.

Whether you have furniture to repair, a floor to finish, a craft to complete, or an instrument to design, this is your product. Goodfilla water-based fillers are so easy to sand you’ll be amazed by how much time you save.

Besides saving time, you can also save money with this good wood filler as it doesn’t shrink, sink, or crack. It also has excellent adhesion making it the best wood filler for exterior use.  This product can be mixed with any pigment, tint, stain, or dye.

What We Liked Most

  • It’s a green product; Zero VOC, zero waste, and non-toxic.
  • It’s a water-based filler
  • It has an unlimited storage life
  • It can create custom colors
  • You can sand, paint or stain it

What Could Be Improved

  • It leaves a yellow tint
  • It has a slightly watery texture

7. Best waterproof wood filler for outside deck – Famo Latex

FamoWood 40022126 Latex Wood Filler - Pint, Natural 24 Oz.
1,764 Reviews
FamoWood 40022126 Latex Wood Filler - Pint, Natural 24 Oz.
  • Dries in 15 minutes
  • Won't crack or shrink, solvent free – low odor and easy water cleanup
  • Can be sanded, drilled or planed

This latex wood filler can handle voids of different sizes. Like other no-mix wood fillers, it can be applied straight from the tub with a putty knife, but it stands above the competition in its no-crack, no-shrink water-based formulation.

It is made of latex and real wood fiber. It cures in 15 minutes to a harder-than-wood surface that can be sanded, planed, and sawed.

The Famo Latex Wood Filler can also be stained or painted, and with multiple colors to choose from, you may well find a shade that matches your project perfectly.

What We Liked More About This Wood Deck Filler

  • It fills cracks quickly
  • It is non-toxic with no solvent fumes
  • Good for interior and exterior use
  •  It can be cleaned with soap and water

What Could Be Improved

  • It has a slightly watery texture

8. Best for small jobs– Elmer’s E855 Carpenter Wood Filler

Elmer's E855 Carpenter's Wood Filler, 3.25-Ounce Tube, White
  • Paintable and sandable
  • Sands easily to a smooth finish
  • Resists shrinking and cracking

From filling nail holes in molding strips to filling gouges in hardwood floors, Elmer’s Carpenters tubes make the wood repair quick and easy.

Due to its size, this formula is excellent when you are looking to fill cracks on the surface of your wooden furniture.

Its squeezable containers improve the ease of application and a convenient size to carry around. This wood filler is water-based and can be sanded and painted.

In addition to the above properties, the Elmer’s E855 Carpenter’s Wood Filler is crack-proof and shrink-proof, which provides a clean and smooth seal to your wooden surface.

Secret tip: put a drop of water in the lid every time you close it up. It keeps 95% of the clogs away that stop the tube from being easy to squeeze.

If you find yourself having to squeeze hard, it’s time to put a drop of water in the lid, close it up for 5 minutes, and then try again.

What We Liked More About This Product

  • It resists shrinking and cracking·     
  • Easy water clean-up
  • Its best for interior

9. Best Exterior Wood filler– DAP Inc 16Oz Latex Plastic Wood Filler

DAP Inc 16Oz Latex Plastic Wood Filler Inc 00529 16Oz Latex...
  • 16 ounce Package
  • Provides a repair that is 3X stronger than the wood itself
  • Fast-acting formula

You can use this dap exterior wood filler if you live in rainy or humid areas because it dries quickly enough that you won’t have to worry about it washing out.

It’s crack and shrink resistant, and you can use it to anchor screws or nails to the side of your deck to hang your flowers or baskets.

You’ll get a smooth and hard finish once it dries completely, and the plastic tub will keep the wood filler soft and moldable until you need it.

The DAP Inc 16Oz Latex Plastic Wood Filler is fast-acting, so you will need to apply it quickly too. because of its resistance to harsh weather, its the best exterior wood filler

What We Liked More About This Wood Filler

  • This wood repair product is 3X stronger than the wood itself
  • It’s an outdoor wood filler
  • It covers chips and gouges while anchoring screws and nails

What Could Be Improved

  • It is difficult to spread
  • It challenging to clean
  • It has an odor

Exterior Deck Wood Filler Comparison Table

How do I Choose the Best Wood Filler for Decks?

It can take many factors to choose a new wooden filler. All of the wood filler may seem very similar in a way but it’s true. These basics will take you from the beginning.

Before diving into your deck repair project, it’s important to explore preventive measures as well. To learn how to prevent a crack in wood from worsening and to maintain the integrity of your deck, we recommend reading our comprehensive guide on this topic.

1. Types of Deck Wood Fillers

Solvent based fillers or Epoxy-Based Wood Filler

These wood fillers contain higher amounts of VOC and, therefore, have more odor. The time it takes for the solvent-based wood filler to dry is about an hour, and you need some turpentine or acetone to clean them.

The thing about these wood epoxy fillers is that they are much more expensive. The reason for the higher price tag is because the solvent-based filler is more durable.

As per durability factors, solvent-based wood fillers are water-resistant, handle most weather conditions, and won’t rot quickly.

The best exterior wood filler epoxy is the Abatron Wood Epoxy 2 kit.

Water-Based Wood Fillers

This is made up of fiber or gypsum and cellulose. They smell less because they don’t have any VOCs (Volatile Organic Compounds).

Certain water-based outdoor wood fillers are considered more useful than their solvent-based counterparts, as they can be diluted with water.

This makes it easier to be used on projects that need a thin filler.  They are mostly in powder form, and the drying time of water-based filler is also convenient. Soapy water clean-up is all that is needed after that.

2. Packaging

Most of the best wood fillers for decks are available in different sizes and packaging. A good packaging use is to protect the wood fillers, and this protection is important because some outdoor wood fillers can turn hard if air gets in.

If your wood fillers have a container that can allow air in, you might have a tragic story like receiving oxidized wood filler. Most wood fillers come in stick form, tubes, or tubs.

The tubs come in two varieties; the one you can use straight away without any mixing, while others come in a two-part system and must be mixed before application.

You can apply these using a spreader or putty knife. These are also more cost-effective, as they come in larger amounts and can be used on bigger projects.

Ensure that you know the size of your projects so that you settle for the right capacity that will serve you right.

3. Amount

The amount of wood deck filler that you need is important to avoid unfinished jobs. Fillers come in many sizes; there’s 3.5oz., 7oz., 16oz., 32oz., and many more.

Depending on the size and depth of your hole, you may have to look for smaller sizes or bigger sizes to get the required amount needed to repair it.

4. Consistency

Wood fillers can have thick (putty-like) or thin (pancake batter-like) consistencies. Putty-like fillers are primarily used to fill voids, while thinner fillers for filling pores in open-grain woods.

It’s important to choose the right consistency for your project, as thicker fillers contain large particles that don’t readily fit into the pores of open-grain woods, and thinner fillers generally lack the body to fill voids adequately.

If you want to fill in nail holes, you’ll need a thicker consistency. Note that some thicker fillers can also be thinned with water to fill pores.

How to Apply Wood Filler to Decks?

How to Apply Wood Filler to Decks

Applying wood deck repair filler is a smooth process if you follow the right procedures. The tools needed are the normal and affordable tools that are handy and can be bought in roadside stores.

The list of tools needed in applying wood fillers to your deck are:

  • Hard brush
  • Sandpaper
  • Deck cleaner/Deck stripper
  • Putty knife
  • Exterior wood crack filler

The process of applying wood deck repair filler is only completed once the filled pores are sanded using medium-grit sandpaper.

Here is how to fix splintered wood deck – step by step:

1. Clearing the wood

For the best results, start with clearing away the rotten wood. The stages of this process are highly similar to all handy work. Once the damage is apparent on the wood, the dented part must be cleansed with a hard brush. This is done to get rid of any splinters.

2. Scraping the wood surface

Next, you’ll have to clean your deck. If your wood surface is finished, use a deck cleaner. If not, a deck stripper is best. ‘Again, it’s vital to follow all the instructions provided with the purchased product.

Allow the deck stripper or cleaner to sit in the wood for a few minutes before moving on to the next application step. Once the stripper or cleaner has sat on the wood, use your hard brush to scrape the surface.

Spray the product clean with a hosepipe and allow the wooden surface to dry before proceeding with the filler.

3. Mixing/Applying wood fillers for exterior

Now, get your putty knife out and scoop some filler out of the tub (if a tub wood filler is what you’re using). If your filler is in 2 parts, you’ll need to carefully measure and mix the two parts using the manufacturer’s recommended ratio.

Got a tube filler? Squeeze the necessary amount on a paper plate or empty ice-cream container and mix it with the correct wood hardener. Once you are done mixing, use the wood putty knife to apply the filler to your deck’s surface.

Press the filler down with the knife properly before you add 1/8 of the filler.  Resume the same process until the hole has been adequately filled and is in line with the rest of the wooden surfaces.

4. Drying Time

Drying time for wood fillers is of utmost importance. First, let the wood deck filler dry, have a look at the directions on the label for the drying time. If the filler shrinks while it cures, add more filler and let it cure a little longer.

Check within the time range to see if it’s cured completely, then use medium-grit sandpaper to sand the surface until it is even with the deck. If there’re more holes, follow the same process—paint and stain when you’re done sanding as needed.

Related: Best wood filler for large holes

What’s the Difference Between Putty and Filler?

Difference Between Putty and Filler

Wood filler and putty are substances that can fix wooden objects, fix defects, and repair mistakes. The wood filler contains wood fibers or sawdust, which is suspended inside a binder. The putty is generally a plastic-like epoxy, polyurethane, or fiberglass.

The differences between Wood Filler and outdoor wood putty:

  • Wood filler is usually water-based, whereas putty is most often oil-based.
  • Wood filler can be sanded and is typically used for unfinished wood, whereas putty can’t be sanded and is ideal for finished wood.
  • Wood fillers should only be used for woodworking items that will remain indoors, whereas putty can be used with projects for any environment

What is the best wood filler for decks?

The Pc Products- 163337 is our favorite wood filler for treated lumber. Its strong resistance against all-weather elements makes it the best exterior wood fillers and indoor wooden surfaces. The formula is made from wood to help it blend into your wood grain better. You can expect this filler to last for years.

Read also: What is the best caulk for painting trim?

What is the best way to repair rotted wood?

For rotten or damaged wood, you can use polyester filler. Apply a wood hardener and filler on the surface. For example, when repairing a rotten window frame: Remove the rotted pieces with a sharpened tool. Once finished, you can then add a coat of the hardener. Next, mix the polyester filler and insert it into the hole with a putty knife.

You can learn How To Repair Splintered Wood decks with our quick guide.

How to Fill Gaps on Wooden Decks?

How to Fill Gaps on Wooden Decks

When the decks become too broad, you will need to do some fixing to avoid any accidents. One of the measures you can use in filling gaps is to remove all boards and reinstall them. However, this process can be expensive and time-consuming.

Another option is to use wood filler or caulk. However, professionals believe that caulking, especially for the gaps on deck, doesn’t always turn out well.

The hardest part is making it look good, and the natural movement of the boards can eventually cause the materials to break loose and make the gaps even worse.

However, you can use fiber ropes to fill the gaps easily. Then even if the size of the gap changes, you can refill it with a new rope.

After you clean the deck, cut a sufficient amount of natural fiber rope to fit each gap’s length. Don’t use synthetic rope because wood stain and paint won’t adhere to the material. Make sure the rope is slightly wider than the gap so you’ll have a tight fit.

Next, pour stain or paint that matches your deck into a bucket, and put the rope in the bucket. Allow it for about an hour so that it reaches the desired color.

After the rope has dried, insert it into one end of the gap and use a flat-head screwdriver to push the rope into the gap until you reach the other end of the board. Use a utility knife to cut the rope’s end and repeat the same procedure to fill in any other gaps.

Related Post: Staining Versus Painting Deck

Deck Crack Filler FAQs

Tell me the best way to fix a deep hole?

For bigger holes, use epoxy which includes two parts. As a final product mixture, the potting agent and the hardener are added and the resulting shape can be molded into holes. Damaged doors and hinges can also be fixed with epoxy.

Read Also: Can you Stain Wood Filler?

Outdoor Wood Filler for Decks Summary

Wood filler is a necessity in every household and workshop. Finding the best wood filler for decks for your wood repair is always a hassle, but that burden has been lifted off your shoulder with this review.

This review should ease your worries on wood deck filler, doubts, or reservations for any of these products and also serve as a guide to getting the perfect wood filler for your job.