Best Epoxy For Filling Large Voids In Wood: Top 8 Picks

Small cracks, holes, or gouges in wood can quickly worsen if left untreated. A fast-setting, easy-to-use epoxy putty is ideal for quick fixes that need to be strong and blend in with the surrounding wood.

J-B Weld KwikWood Epoxy Putty Stick is designed for rapid, convenient repairs. Its hand-mixable formula sets in under half an hour and cures in just one hour, making it perfect for minor jobs where time and simplicity matter most.

• Fast cure time: Sets in 15–25 minutes and fully cures in 1 hour
• Stainable and sandable: Can be finished to match surrounding wood
• No shrinkage or rot: Maintains repair integrity over time

Unlike larger, two-part pastes, this putty stick focuses on speed and ease of use for small-scale fixes. It’s not intended for major structural repairs or large voids, but it excels at patching minor damage around the home.

Repairing wood that’s been damaged by rot, moisture, or pests often requires a solution that can handle both indoor and outdoor conditions. A reliable epoxy paste is essential for restoring structural integrity and appearance in everything from window sills to deck posts.

PC Products PC-Woody Epoxy Paste Kit stands out for its adaptability, making it a strong choice for homeowners tackling a variety of repairs. Its high tack formula reduces mess, and it’s well-suited for both interior and exterior projects where durability is key.

• Wide temperature range: Usable from 35°F to 115°F, suitable for most climates
• High tack consistency: Helps prevent drips and sags during application
• UV and water resistance: Withstands exposure to sunlight and moisture for lasting repairs

Compared to standard wood fillers, this epoxy paste prioritizes versatility and resilience. It’s more involved to mix than some alternatives and not ideal for very small repairs, but it offers dependable results for most household wood restoration jobs.

Extensive termite damage often requires a filler that can handle bigger jobs and rebuild missing wood sections. Epoxy wood putties are valued for their strength and durability, making them a go-to for structural repairs.

Boncart Epoxy Wood Putty offers a high-strength, two-part formula designed for both indoor and outdoor repairs. Its large capacity makes it ideal for homeowners or DIYers facing widespread damage or multiple projects, and its waterproof properties ensure long-lasting results.

• High-Strength Epoxy: Provides structural support and resists cracking or shrinking
• Waterproof and Weather-Resistant: Suitable for both interior and exterior repairs
• Large Volume: 21.16 oz size covers more area, reducing the need for multiple purchases

Unlike traditional fillers, this epoxy putty excels at rebuilding and reinforcing damaged wood. The tradeoff is a more involved mixing process and a longer cure time before the area can be finished.

Addressing missing or decayed wood in frames, sills, or posts often requires a paste that’s easy to work with and sized right for common household repairs. A mid-size kit ensures you have enough material without overbuying.

PC Products PC-Woody Epoxy Paste Kit 12 oz is tailored for these needs, offering a blend of strength, weather resistance, and manageable quantity. It’s ideal for homeowners who want a reliable, all-purpose solution for mid-sized projects.

• Application temperature range: Usable from 35°F to 115°F for seasonal flexibility
• High tack formula: Reduces drips and sags during application
• Includes mixing tool: Helps ensure correct ratios for best results

This kit stands out from smaller putties by providing enough product for several repairs, while remaining more manageable than bulk sizes. Mixing precision is important, and it’s less suited for very small or very large jobs.

Severely rotted or weakened wood often needs both consolidation and filling to restore its strength. Bundled kits that include both a hardener and an epoxy paste offer a comprehensive solution for these challenging repairs.

This PC-Products bundle combines a 32 oz wood hardener with 24 oz of epoxy paste, making it ideal for users tackling extensive rot or structural damage. It's especially useful for restoring window sills, beams, and trim where both stabilization and filling are required.

• Includes hardener and filler: Strengthens and rebuilds damaged wood in one package
• Large kit sizes: Suitable for multiple or large-scale repairs
• Paintable and machinable: Can be finished to match surrounding wood

Compared to single-product kits, this bundle provides a more thorough repair process. The main tradeoff is the higher upfront cost and more involved application steps.

Large restoration projects or repeated repairs call for a bulk epoxy paste that can handle high volume needs. This format is essential for professionals or serious DIYers working on multiple or oversized wood repairs.

PC-Woody 96 oz delivers a substantial amount of high-tack epoxy paste, perfect for tackling everything from beams to large exterior trim. Its weather-resistant formula ensures repairs last, even in tough conditions. This is the go-to choice for those who need both quantity and quality.

• 96 oz bulk size: Ideal for large projects or frequent use
• Weather and chemical resistant: Handles outdoor exposure and treated wood
• Long work time: 30–40 minutes for adjustments before curing

Compared to smaller kits, this bulk option is far more economical for big jobs but may be excessive for occasional or small repairs.

Large-scale wood restoration projects, such as repairing windows, doors, or columns, require a substantial amount of filler that’s also safe for indoor use. Choosing an eco-friendly epoxy helps minimize exposure to harsh chemicals during big jobs.

Abatron WoodEpox Kit 2 Quart offers a generous quantity with GREENGUARD certification and virtually no VOCs. It’s ideal for extensive repairs where a clean, low-odor working environment is a priority.

• Large volume kit: Suitable for multiple or large repairs
• Low VOC and odor: Safer for indoor and prolonged use
• Structural, shrink-free repairs: Mimics the properties of real wood

Unlike smaller kits or solvent-heavy fillers, this product prioritizes safety and environmental impact. It’s less convenient for quick, minor fixes due to its size and longer cure time, but it excels in larger, health-conscious projects.

Stabilizing and sealing wood that has been compromised by rot often requires a liquid epoxy that can penetrate deep into the grain. This approach is crucial for restoring strength before cosmetic repairs.

RTG Supply Co's Wood Rot Repair Epoxy is a clear, two-part liquid designed to harden and seal damaged wood from within. It's a good fit for users who need to treat rot in beams, posts, or other structural elements before filling voids.

• Deep penetration: Stabilizes and hardens wood fibers below the surface
• 100% waterproof: Protects against future moisture damage
• No VOCs or odor: Suitable for indoor and outdoor use

Unlike paste or putty, this liquid epoxy is not intended for filling large gaps but excels at consolidating weakened wood. The tradeoff is the need for a separate filler to complete the repair.