Permatex silicone Ultra

PERMATEX Ultra Silicone Gasket Maker: The Ultimate Seal for Marine Maintenance and Protection

Ensure the reliability and longevity of your marine equipment with PERMATEX Ultra Silicone, the premium-choice RTV silicone gasket maker designed to withstand the harshest boating environments. When you´re out on the water, you can´t afford a component failure. That´s why professionals and dedicated boat owners trust PERMATEX to deliver a dependable, long-lasting, and leak-proof seal for critical engine and mechanical parts. This advanced formula provides a significant upgrade over traditional gaskets, offering superior performance and peace of mind for all your marine maintenance and repair projects.

Engineered for the demanding conditions of marine applications, PERMATEX Ultra Silicone creates a flexible yet incredibly durable "formed-in-place" gasket that perfectly conforms to the unique shapes of mating surfaces. This technology ensures a flawless seal, even on components subject to intense vibration, thermal expansion, and contraction. Protect your investment by preventing leaks of vital fluids like oil, coolant, and transmission fluid, which can lead to catastrophic engine damage and costly repairs. Whether you are performing routine maintenance on your inboard engine, sealing a water pump, or tackling a more complex repair, this is the sealant that delivers unmatched performance and reliability.

What sets PERMATEX Ultra Silicone apart is its advanced formulation, which is specifically designed for modern engines and sensitive components. It is the ideal choice for a wide range of sealing applications on your boat, including valve covers, oil and transmission pans, water pumps, thermostat housings, and intake manifold end seals. Its exceptional durability means you do the job once and trust it to hold, season after season.

Discover the superior properties that make PERMATEX Ultra Silicone the gold standard in gasketing technology:

Sensor-safe, low odor, non-corrosive.

Outstanding oil resistance and joint movement valves.

Eight times more flexible than cork/composite gaskets, three times more oil resistant than conventional silicones.

Temperature range -75° F to 500° F intermittent, resists auto and shop fluids and vibration.



The non-corrosive nature of this silicone ensures it won´t damage metal surfaces, while its sensor-safe formula makes it perfectly suitable for use on modern, electronically controlled marine engines without fear of interfering with sensitive oxygen sensors and other electronics. The low-odor characteristic also provides a more pleasant working experience during application. Forget brittle, leaky cork gaskets that crack under pressure. PERMATEX Ultra Silicone’s incredible flexibility allows it to absorb engine vibration and maintain a perfect seal where rigid gaskets would fail. When it comes to protecting your engine from leaks, its superior resistance to oil and other shop fluids is simply unparalleled. Equip your marine toolkit with the professional-grade sealant that manufacturers trust. Choose PERMATEX Ultra Silicone for a robust, flexible, and permanent seal you can count on