Gorilla Mold Resistant Sealant is a versatile sealant that is ideal for the whole house, indoors and outdoors. This sealant is mold resistant, flexible and will not turn yellow, shrink or break over time. In addition, it is 100% waterproof and can be exposed to shower water or rain in just 30 minutes.Use: All surfaces must be clean and free of dirt, grease, oils and old sealants. For gaps larger than 12 mm use a support bar to fill the gap. Best if applied above 5˚C.