Flexible Epoxy Wood Filler FILL IT High-Strength & Sandable Non-Sag
Price range: $34.00 through $337.00
Ships within 1-5 business days
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This all-in-one kit combines a penetrating epoxy sealer, a flexible epoxy filler, and an application guide to help you permanently repair wood damaged by rot. Whether you’re dealing with windows, doors, fascia boards, or outdoor trim, this system reinforces from within and restores original shape and strength.
Flexible Epoxy Wood Filler – High-Strength & Sandable
Repair, shape, and restore wood — with a filler that moves with it, not against it.
This two-part epoxy wood filler is designed for structural and cosmetic repairs. Unlike traditional fillers that crack over time, this formula remains slightly flexible after curing — allowing it to expand and contract with the natural movement of the wood.
✔ What is Flexible Epoxy Wood Filler?:
A strong yet slightly flexible epoxy filler that can be sanded, shaped, drilled, and painted. Ideal for repairing damage, filling gaps, and restoring the original appearance of wooden surfaces — indoors or outdoors.
✔ What Epoxy Wood Filler is for:
- Filling cracks, gouges, voids, and rotten areas
- Rebuilding missing wood sections (edges, corners, trims)
- Restoring window frames, sills, and moldings
- Blending repairs seamlessly with original wood
✔ Why works:
- Flexible: won’t crack or fall out as wood moves over time
- High adhesion: bonds tightly to wood and epoxy-treated surfaces
- Structural strength: supports load-bearing areas when fully cured
- Takes finishes well: can be painted, stained, or coated after sanding
✔ Ideal for:
- Exterior wood exposed to changing weather
- Windows, doors, fascia boards, and trims
- Furniture and decorative woodwork
- Boat repairs and restoration projects
✔ How to use Epoxy Wood Filler:
- Mix equal amounts of Part A and Part B until uniform in color.
- Apply using a putty knife, spatula, or gloved hand.
- Shape as needed — it holds form well and won’t slump.
- Allow to cure for 6–24 hours depending on temperature.
- Sand, drill, or coat once fully hardened.
Tip: For deeper cavities or structural rebuilds, layer the filler in stages.
✔ Outside America:
Additional Information
Reviews
Awesome product! I discovered it while working on my boats and use it alot in construction. I used it on a set of doors I built for my garden shed and they still look beautiful 3 years later. It’s pretty nasty stuff when using it so use it outside or a well ventilated area and use gloves and respirator.
Using this stuff years ago under the front deck…I believe I had a 60’s flashback…felt real good
Fumes are nasty as it cures, so wear a respirator, not just a dust mask. Careful about getting it on your skin, it burns. I coated the bottom of my Lyman when restoring which was too big to flip, so I bought a cheap Harbor Freight full face mask. Worked great at protecting me from chemical burns and just throw it away when done.
Used and loved the stuff for years. Don’t forget the FILLIT stuff they sell…super for fill and repair. John in VA
Dennis –
Works as advertised, it is a bit stiff, got to mix it till color is consistent.
Dries hard and ready for work. Product gives me confidence that project will be successful.