Product Description Bondo All-Purpose White 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. Our hardener is smooth and easy to mix with fillers putties and glazes. From the Manufacturer For use with Metal Repair Compound Concrete Brick and Stucco Repair Compound Wood Filler and All-Purpose Putty (2.75 oz)