The edges of the hole need to be firm and solid; any loose material will break away over time, causing the patch to detach. 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.
Comprehensive Repair Guide for Decayed Wood Holes
Even a perfectly flush repair will stand out if it is a uniform color compared to the aged wood surrounding it. Sanding this hardened mass flush requires heavy grit sandpaper, but the result is a rock-hard surface that accepts paint or stain without issue.
The key to a clean result lies in the finishing of the patch. A clean break from a dropped tool is fundamentally different from crumbling rot, and the repair strategy must reflect this.
Assessing and Stabilizing Decayed Wood Before Filling Holes
Large holes with straight, vertical sides act like a small pocket, making it difficult for the filler to lock in place. To assess the damage, probe the wood around the hole with a sharp tool.
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