In the paper a Room Temperature Vulcanizing Silicofluoric (RTVSIF) polymer as a long time anti-pollution flashover coating is presented. RTVSIF polymer painted and solidified on the surface of porcelain insulator can increase the insulator pollution performance obviously because of the excellent lu-bri city and hydrophobicity of the coating. It is confirmed that the RTVSIF polymer is a kind of ideal anti- pollution coatings through the artificial expedite lighting ageing test