Originally engineered for aerospace and aviation applications, 303 Aerospace Protectant is a premium surface treatment that instantly provides superior protection against harmful UV rays that can cause discoloration, fading, cracking and chalking of surfaces. 303 Aerospace Protectant also repels dust, dirt, lint, soiling, staining, water spots, salt water, and mildew. Safe and effective for vinyl, gel-coat, fiberglass, carbon fiber, synthetic/natural rubber, plastics, and finished leather. Use 303 Aerospace Protectant on swimming pool and hot tub covers.