3M 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. This hardener is smooth and easy to mix in.Use with Our Many 2-Part Fillers and Glazes 3M Cream Hardener is a hardening agent designed to work with our 2 part 3M, Dynatron and Bondo fillers, putties and glazes. The creamy consistency mixes easily and quickly. Our hardener combines the best of ease of use and quality final results. The hardeners should not be used by themselves. Tinted Colors Help with Consistency Cream hardeners with tinted colors help you ensure consistency when mixing hardener and filler together. The color of the cream hardener will not affect curing. Our white cream hardener is ideal for situations in which a neutral color is preferred. The white color allows for keeping the mixture the natural color of the product being used.