Mercury Quicksilver Perfect Seal (Permatex Aviation Form-A-Gasket, Mercury-supplied) is a genuine OEM, non-hardening sealing compound specified by Mercury Marine for critical marine sealing applications where flexibility, chemical resistance, and long-term reliability are essential. Mercury now supplies Permatex Aviation Form-A-Gasket in a Mercury box with part number 92-8M0170149 in lieu of the original Perfect Seal branded tin, with the former part number 34227Q02 superseded to the current Mercury supply, ensuring identical performance while maintaining OEM compliance.
On Mercury outboards, Perfect Seal is commonly used on thermostat housings, water jacket covers, fuel pump gaskets, oil tank fittings, crankcase cover interfaces, and threaded fasteners exposed to oil or cooling water, where a pliable seal is required without permanently bonding parts together. On MerCruiser sterndrives and inboard engines, it is specified for exhaust manifold and riser gaskets, timing covers, circulating water pump gaskets, oil pan corners, gear housing fasteners, and cooling system fittings, particularly where surfaces are closely machined but subject to vibration, heat cycling, and fluid exposure. Using the correct Mercury-approved Perfect Seal / Permatex compound is important because it prevents oil, fuel, coolant, and water leaks without hardening, allows future disassembly during servicing, and helps protect engines from corrosion, fluid intrusion, and premature gasket failure in harsh marine environments.
Note: Always verify the compatibility of replacement parts with your specific engine model and serial number. For assistance, consult your Mercury Marine dealer or refer to the Mercury Parts Catalog.