Dowsil™ 680 Sanitary Sealant. High Performance Neutral Cure Silicone Sealant. Designed to resist the growth of mould and mildew where conditions of high humidity and temperature exist. Ideal for use in and around bathrooms, laundries and wet areas. Excellent adhesion to most ceramic tiles, vitreous china, glass, aluminium, enamel painted surfaces and fiberglass spa units.