Knot-Tec™ Wood Repair System from Power Adhesives is designed to repair and fill knots and other surface damages to wood, without cutting, before finishing. The kit includes a hot-melt glue gun, one-half-inch diameter glue sticks in four different colors to match various woods, and metal heat sink blocks to be placed over the area being repaired. The kit from Power Adhesives, a company based in the United Kingdom, sells for about $107.