The edge of the filled area should be flush and smooth, with no sharp ridges. You must create a clean, solid edge for the filler to grip onto.
How to Choose the Right Filler for Large Damage and Gaps
Standard spackle or lightweight putty is unsuitable for wide voids; they crack easily and lack the necessary strength. Sanding too early is a common mistake that results in gummy residue and ruined repairs.
Press the filler deep into the bottom of the gap using a putty knife or your finger, ensuring it packs tightly. If you fill the gap exactly to the surface level, the wood movement will eventually pull the filler away, creating a crack.
Selecting the Correct Filler for Substantial Wood Gaps
Unlike paste fillers, epoxy fills space completely and does not shrink as it cures. Epoxy Wood Filler Epoxy-based fillers are the industry standard for serious repairs.
More About How to use wood filler for large gaps
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