GE Gutter Silicone 2 Sealant, Clear, 10.1oz. From the #1 Silicone Brand, Gutter Silicone 2 sealantisahigh-performance, 100%siliconeand100% waterproofsealant for use on metal and vinyl gutters and other exterior applications. This 30-minute rain-ready formula is clear in color and offers permanent flexibility and excellent durability with 10-year mold-free product protection to resist mold and mildew growth. Backed by a lifetime guarantee.