303 Aerospace Protectant is the most powerful UV screening protection ever made. Originally developed for aerospace and aviation applications, 303 repels harmful ultraviolet radiation and is really helpful in prolonging the lifetime of your raft. 303 is a premium surface treatment that provides superior protection against harmful UV rays that can cause loss of mechanical properties such as: discoloration, fading, embrittlement, cracking and/or chalking. Treated surfaces repel dirt, soiling, staining, water spots, salt water and mildew. Use it on lots of boating and household gear.