New WEST SYSTEM® Wood Rot Repair Kit
Spring, 2026
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By Jenessa Hilger – GBI Marketing
Wood rot has a way of showing up in the worst places—a soft spot on a window sill, a spongy floor in your RV, a crumbling splash rail on your boat. Whatever the situation, the fix used to mean tearing things apart. Now there’s an alternative method.
The WEST SYSTEM® Wood Rot Repair Kit is a penetrating epoxy system designed to stabilize rotted, deteriorated wood without requiring full replacement. It soaks deep into damaged wood, reinforcing it from the inside out. The flexible formulation moves naturally with the wood so it won’t crack over time.
Why Wood Rot Repair Epoxy
Rotted wood loses its structural integrity because decay breaks down the wood fibers. Wood Rot Repair Epoxy has low viscosity, allowing it to flow through the wood grain and fill the voids left by deterioration, rebuilding strength where it’s needed most.
The epoxy has a working time of 30–40 minutes (at 72°F/22°C), giving it plenty of time to migrate through the wood before it begins to cure. In thin films, that window is even longer, which means more penetration and better consolidation.
Why Wood Rot Repair Epoxy
Rotted wood loses its structural integrity because decay breaks down the wood fibers. Wood Rot Repair Epoxy has low viscosity, allowing it to flow through the wood grain and fill the voids left by deterioration, rebuilding strength where it’s needed most.
The epoxy has a working time of 30–40 minutes (at 72°F/22°C), giving it plenty of time to migrate through the wood before it begins to cure. In thin films, that window is even longer, which means more penetration and better consolidation.
Where to Use
The Wood Rot Repair Kit can be used for many common repairs that have rotted or damaged wood, including:
Home
Door thresholds, windowsills, porch railings, and any structural wood exposed to moisture
RV
Soft floors, delaminated panels, and water-damaged framing in hard-to-reach areas
Boat
Splash rails, window frames, upholstery frames, and planking above the waterline
General
Wood rot, stabilizing punky wood, split/cracks
If the wood is hard to reach or impossible to replace, Wood Rot Repair Epoxy is worth considering. Its penetrating formula makes it particularly effective in situations where access is limited and removal isn’t practical.
Easy to Mix, Easy to Apply
Wood Rot Repair Epoxy mixes at a 2:1 ratio by volume. Each kit includes a reusable mixing bottle with pre-printed measurements. Fill to the line, mix, and you’re ready to go. The bottle’s nozzle is sized for injecting epoxy directly into cracks and crevices, which forces the material deeper into the wood and speeds up penetration.
The 1.5 quart and 1.5 gallon kits also include a mixing pot and stir stick for mixing larger batches. All kits come with gloves and detailed instructions.
As a general guide, 4 fl.oz. (118.3 mL) of mixed epoxy covers approximately 50 in² (320 cm²), though coverage varies based on how porous and deteriorated the wood is.
Tips Before Starting
Dry the wood first.
Wood Rot Repair Epoxy will cure on damp wood, but moisture limits penetration and reduces the strength of the repair. For best penetration and to minimize potential for continued rot growth, aim for a moisture content under 12%.
Remove loose material.
Clear away as much weakened wood as possible before applying epoxy. Excess debris can prevent the epoxy from flowing freely into uncompromised wood, which has the strongest bond.
Temperature matters.
The epoxy cures down to 50°F (10°C), extending your working season from early spring to late fall. For the best balance of flow and working time, 70°F (21°C) is the sweet spot. In warmer temps, the epoxy flows more easily but cures faster. In cooler temps, it thickens and slows down.
Work in stages.
Apply the epoxy liberally into cracks first, then coat the surrounding surface. As the wood absorbs the epoxy, reapply until the wood is fully saturated. Keep applications under ½” (1.27 cm) thick to prevent excessive exotherm.
Filling Larger Voids
When rot leaves significant voids, penetrating epoxy alone may not be enough to complete the repair. WEST SYSTEM Fillers can be blended into mixed Wood Rot Repair Epoxy to create a non-sag paste for filling gaps and rebuilding shape. WEST SYSTEM 407 Low-Density Filler sands and shapes easily for a smooth finish. WEST SYSTEM 405 Filleting Blend is a higher-density option with a darker wood tone that blends more naturally with surrounding material.
Finishing
Once cured, wash the surface with a Scotch-Brite™ pad and water to remove amine blush, then sand to the final shape. Wood Rot Repair Epoxy is compatible with most topcoats. Paints, varnishes, and polyurethanes all work well. A UV-stable topcoat is recommended to protect the repair long-term.
For questions about working with epoxy or which size kit is right for your project, contact the WEST SYSTEM Technical Staff at 866-937-8797 or visit westsystem.com.
Wood Rot Repair Kit Sizes:
12 oz Kit
Small repairs,
single spots.
1.5 Quart Kit
Mid-size repairs,
multiple areas.
1.5 Gallon Kit
Large projects
or repeat use.
