This cream hardener mixes with 2-part fillers, putties and glazes to create high-quality, long-lasting repairs. When filler and hardener are mixed, a chemical reaction occurs to create a mixture that will deliver a strong, lasting repair to metal, masonry, concrete, painted wood, bare wood, drywall and more. The resulting repair can be sanded in 15 minutes and painted in only 45 minutes. The product once mixed with the filler/glaze dries to the natural color of the filler/glaze which can be easily covered with most primer and paint. The hardener is smooth and easy to mix with fillers, putties and glazes. Its creamy consistency mixes easily and quickly.