Finishing for a Natural Look. Standard spackle or lightweight putty is unsuitable for wide voids; they crack easily and lack the necessary strength.
Understanding Large Gap Filler Drying Time for Optimal Results
Sanding for Integration Once the filler is fully cured, begin the sanding process. While surface drying might occur within an hour, the chemical cure deep inside the wood takes significantly longer.
You should start with a coarse grit, such as 80 or 120, to level the "hill" of filler down to the surface of the wood. You need to create a "hill" of filler that will be sanded down later.
Understanding Large Gap Filler Drying Time for Optimal Results
Smooth the excess material so it tapers down to the edge of the solid wood. 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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