Optimum Grey RTV 3 Oz. Silicone

Optimum Grey RTV 3 Oz. Silicone by PERMATEX is a professional-grade sealant engineered for demanding sealing and bonding applications across automotive, industrial, and household projects. RTV (room-temperature vulcanizing) silicone cures at ambient temperature without the need for heat, oven-curing, or catalysts, making it ideal for technicians and DIY users who require reliable, fast-setting results. This versatile sealant excels in applications where traditional gaskets or liquid adhesives fall short, offering flexibility and durability in high-vibration and temperature-cycling environments.

The grey formulation provides excellent adhesion to metal, glass, rubber, and most plastics while remaining flexible after cure, allowing for thermal expansion and vibration absorption without cracking or separation. PERMATEX's Optimum Grey RTV silicone creates a waterproof, oil-resistant seal that maintains integrity across a wide temperature range, making it suitable for engine gaskets, valve covers, oil pans, transmission pans, and sensor housings. The 3 oz. tube format includes two precision nozzles for controlled application, enabling users to dispense exactly the amount needed and minimize waste while ensuring consistent bead placement.

Automotive technicians, fleet maintenance crews, and restoration specialists rely on this sealant for engine rebuilds, transmission servicing, and valve cover replacement where factory gaskets have deteriorated. The product's compatibility with standard automotive fluids—including gasoline, diesel, coolant, and transmission fluid—makes it essential for any serious mechanic's toolkit. Installation is straightforward: simply apply a continuous bead to clean, dry surfaces, assemble parts within the workable time, and allow 24 hours for full cure before exposure to operational fluids and heat.