3X: Chemistry Seal Saver is a foaming rubber seal conditioner shields and conditions expensive RV slide out seals. Prolongs seal life by providing UV protection and decreasing friction during slide out extension. Leaves a light, water-repellent film compatible with all rubber seals and adjacent surfaces.* Extends Seal Life, keeps seals pliable and helps prevent tearing and sticking. Fortified with lubricating PTFE.* Protects & Conditions, offers UV protection and fights deterioration caused by road film, oxidation and the elements.* Non-Staining,easy to apply foam is non-staining and safe for adjacent surfaces. Use for window and door seals or gaskets on your RV or automobile* Seals, leaves a water repelling film that resists corrosion-causing moisture.