Fill the Wood Knot: Before filling, make sure that the area is dust-free. Then, fill the knothole with knot filling adhesive.  Use Heat Sink Blocks: Use a heat sink block to rapidly cool the repair material or create blocks to prevent the adhesive from overflowing. Trim Excess: Wait a few minutes for the adhesive to cool then trim away the excess with a mousplane flush plan tool. The mouseplan is usually a carbon steel blade that makes it fast and easy to remove excess adhesive. Place a silicone release mat underneath your glue gun to help keep your work surface clean. Finish Work: Your area is now repaired and can be sanded, painted, or treated your usual way, achieving a high-quality finish to the restored wood.