Permatex® Water Pump & Thermostat RTV Silicone Gasket Maker

Permatex® Water Pump & Thermostat RTV Silicone Gasket Maker

Permatex Water Pump & Thermostat RTV Silicone Gasket is a single component, room temperature vulcanizing gasketing compound designed to provide reliable “formed-in-place” gaskets for mechanical assemblies. This material cures on exposure to moisture in the air to form a tough, flexible, silicone rubber gasket. The product resists aging, weathering and thermal cycling without hardening, shrinking or cracking. Provides the highest water-glycol resistance available in an RTV silicone. 


1. Remove all previous material from mating surfaces. Permatex Gasket Remover is recommended for most materials, not for plastics or painted surfaces.

2. For best results, clean and dry all surfaces with a residue-free solvent, such as Permatex Brake and Parts Cleaner.

3. Remove cap and puncture tube seal.

4. Apply a continuous and even bead of silicone (approximately 1/8” in diameter) to one surface, first tracing the internal areas of the gasket configuration, then all surrounding bolt holes as shown below: 

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