Armor-Sil R/G is the only hard silicone coating in the world including our marine-grade barrier coating is the complete system for propellers and shafts. It is a highly engineered blend of silane/siloxane that forms an exceptionally hard, durable and hydrophobic coating film on the running gear surface. Armor-Sil R/G delivers optimum running gear performance for all types and sizes of vessels, a truly non-toxic and environmentally sustainable solution for your propeller and shaft needs with a proven longevity of 3 years or more. Armor-Sil R/G contains no heavy metals or chemical biocides. And the coating does not ablate or Polish off.