303® Aerospace Protectant keeps UV-sensitive materials "like new" year after year!, 303 is the leader in UV Screening Technology. 303 Aerospace Protectant really is like "SPF 40 Sunscreen ... For Your Stuff." Regular use gives 100 Percent Prevention of UV caused slow-fade with regular use. No other "protectant" beautifies as intensely, protects as powerfully or lasts as long. The World's Most Manufacturer-Recommended Product. Safe and effective on vinyl, clear vinyl, gel-coat, fiberglass, carbon fiber, synthetic/natural rubber, plastics and finished leather.