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The Cooling iron is a perfect tool to have at hand when making wood repairs with Knot Filler. Place the Cooling iron on top of the warm Knot Filler after it has been shot into the knot/repair. The Cooling iron presses the Knot Filler into the repair and increases the durability of the Knot Filler and quickly cools the repair so it is ready to be cut and sanded.
