Permatex The Right Stuff 1 Minute Grey Gasket Maker, 3 oz — Sensor-Safe High-Temp Sealant

Permatex The Right Stuff 1 Minute Grey Gasket Maker is a sensor-safe, high-temperature RTV sealant that forms a durable, blowout-resistant elastomeric gasket in about one minute.

Compact and formulated for modern engines with closely spaced bolt patterns, this 3 oz tube delivers a fast-setting grey gasket compound built to resist oil, coolant and automatic transmission fluid. It cures to a flexible rubber seal that withstands continuous temperatures up to 450°F (232°C) and intermittent peaks to 500°F (260°C), making it suitable for many automotive sealing tasks where precut gaskets are impractical or unavailable.

How quickly will a leakproof gasket form with this product?

The Right Stuff 1 Minute sets rapidly so you can put assemblies back into service sooner than with traditional RTVs. It skins over in roughly one minute under typical shop conditions and achieves a reliable elastomeric seal that prevents blowouts during torqueing and initial operation.

• Initial skin time: about 1 minute
• Develops elastomeric strength quickly for leak resistance
• Reduces wait time before torqueing and reassembly

Will this gasket maker handle modern engine fluids and heat?

This formula resists common powertrain fluids—motor oil, coolant, and ATF—so the cured gasket maintains sealing performance in contact with those liquids. Its thermal tolerance supports continuous engine temperatures to 450°F and intermittent spikes to 500°F, suitable for many engine and transmission locations.

• Resistant to oil, coolant, and automatic transmission fluid
• Continuous temperature rating: 450°F (232°C)
• Intermittent temperature rating: 500°F (260°C)

Is The Right Stuff safe around sensors and delicate components?

Yes—this gasket maker is formulated to be sensor-safe, minimizing the risk of interference with oxygen sensors and other nearby engine electronics when used as directed. Its cured rubber does not require precut gaskets and can be applied precisely to avoid contaminating sensor ports or passages.

• Sensor-safe formulation to protect oxygen sensors and electronics
• Applies as a controllable bead for precise sealing
• Outperforms many precut gaskets in tight bolt patterns

What applications and surfaces is this product best suited for?

The Right Stuff is intended for automotive sealing tasks where bolt spacing or part geometry makes precut gaskets impractical. Typical uses include valve covers, oil pans, transmission pans, thermostat housings and water pumps—but it also works anywhere a flexible, fluid-resistant gasket is required.

• Valve covers, oil pans, transmission pans
• Thermostat housings and water pumps
• Engines with closely spaced bolts and import vehicle patterns

Who is this for: Mechanics, restoration enthusiasts, fleet technicians and DIYers who need a fast-setting, reliable gasket solution for engines and powertrain components. If you work on modern engines with tight bolt patterns or want a durable, sensor-safe seal that withstands oils and high temperatures, The Right Stuff 1 Minute Grey Gasket Maker offers a compact, shop-ready option in a 3 oz tube.