This silicone is a clear in colour acetoxy cured and is permanently waterproof and flexible, produced from a superior silicone formula contains the most powerful anti-fungal and anti-biocidal agents required to resist the appearance of black mould growth.Soudal Stay Fresh acetoxy is also food safe making it safe to use in food preparation areas in kitchens and cafeterias, in the home and in commercial kitchens.This Acetoxy sealants is not recommended for application onto plastics, such as PVC windows use Soudal Stay Fresh neutral cure instead.