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.Formulated and packaged under controlled conditions to ensure consistent performanceEasy mixing produces a quicker hardener and filler blendFor use with all fillers, putties and glazesFormulated exclusively for use with 3M Bondo fillersUse during the fill stage of the 3M body repair system