Mars 93252 Silicone Sealant 10. For the last 50 years Mars has been an operated supplier of quality motors, components, and service/installation parts for the HVAC industry. Mars distributes its own aftermarket replacement products, as well as the original equipment components of leading manufacturers. This Grey Silicone Sealant is a rubber sealant provides excellent durability, flexibility and adhesion for a long-lasting, waterproof seal. Resists to cracking, crumbling and chalking.