The edge of the filled area should be flush and smooth, with no sharp ridges. If the wood is oily or greasy—common in kitchen cabinets or workbenches—a light wipe down with denatured alcohol will remove any contaminants.
Ensuring Strong Filler Bond Through Proper Surface Preparation
You need to create a "hill" of filler that will be sanded down later. Laminated Wood or Wood Scraps For the largest gaps—such as those found between deck boards or wide splits in table tops—sometimes the best "filler" is actually a piece of wood.
Wood naturally moves, expanding and contracting with humidity. Whether you are sealing a wide crack in a hardwood floor, bridging a space in a piece of furniture, or fixing structural damage in wall paneling, the standard methods for small holes often fail.
Critical Surface Prep for Maximum Filler Adhesion
Unlike paste fillers, epoxy fills space completely and does not shrink as it cures. If you fill the gap exactly to the surface level, the wood movement will eventually pull the filler away, creating a crack.
More About How to use wood filler for large gaps
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