Sanding this hardened mass flush requires heavy grit sandpaper, but the result is a rock-hard surface that accepts paint or stain without issue. Even a perfectly flush repair will stand out if it is a uniform color compared to the aged wood surrounding it.
Permanently Fixing Large Exterior Wood Holes with a Structural Wood Patch
The Structural Approach: Using a Wood Patch For the largest holes, particularly those where the structural integrity of the board is in question, a solid wood patch is the most reliable method. If the material feels soft, spongy, or crumbles easily, you are dealing with rot.
The grain direction of the patch should ideally match the surrounding board. For holes caused by decay, simply filling the space is insufficient, as the compromised wood surrounding the hole will likely continue to deteriorate, undermining the repair from within.
Permanently Fixing Large Exterior Wood Holes with a Structural Wood Patch
Epoxy fills create a bond that is stronger than the wood itself, making it resistant to vibration and movement. This mixture is sculpted slightly proud of the surrounding surface to account for shrinkage as it cures.
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