What is this rubber underlay?

Contains the best anti-rust and corrosion resistance functions. This product has a strong ability to form a film and creates a special protective layer to protect rubber and metal underneath vehicles and motorcycles. Easy to apply without any damage to the surface. Product specifications: A protective film that is anti-rust and corrosion-resistant and protects the metal. Applied to rubber body parts such as bumpers, luggage guards, sanding boards, and other rubber components.