Permatex Ultra Grey RTV Silicone Gasket Maker 13 oz — Rigid High-Torque, Sensor-Safe

This 13 oz cartridge supplies a professional-grade silicone RTV designed to stand up to severe service on import and domestic engines. It tolerates a wide temperature span, resists oils and coolant, and cures to a rigid, tear-resistant gasket that maintains sealing integrity under vibration and torque. The low-odor, non-corrosive formulation is suitable for sensitive assemblies and meets OEM performance expectations for many maintenance and repair tasks.

How does this gasket maker hold up under heavy vibration and torque?

The Ultra Grey formula cures to a firm, durable gasket that resists deformation from repeated stress and high clamping forces. Its rigid set reduces extrusion and keeps sealing surfaces aligned, helping prevent leaks where engines see constant movement or heavy loads.

• Rigid-cure RTV resists squeeze-out under clamping pressure
• Formulated for high-vibration automotive applications
• Maintains shape at clamped seams and threaded fasteners

Is this safe to use near sensors and delicate components?

Yes — this product is described as sensor-safe and non-corrosive, minimizing the risk to nearby electronics and metal surfaces when used as directed. Its low-odor chemistry also reduces fumes during application, improving workshop comfort.

• Non-corrosive chemistry protects metal parts and fittings
• Sensor-safe formulation for modern engine assemblies
• Low odor for easier application in enclosed spaces

What fluids and temperatures can it withstand?

Ultra Grey offers strong resistance to motor oils, coolant, and common shop fluids, making it suitable for areas exposed to fluids and heat. It performs across a broad operating range, with intermittent temperature resistance that covers many engine and drivetrain environments.

• Resists oils, coolants, and routine shop chemicals
• Temperature capability from very cold up to high intermittent heat
• Recommended for applications that alternate between hot and cold cycles

Which engine parts is this gasket maker best suited for?

Designed for sealing hard-to-reach or irregular surfaces, this RTV is commonly used where a formed gasket is preferred to a pre-cut paper or cork gasket. It adheres to metal and many mating surfaces to create a dependable seal on common engine components.

• Valve covers and oil pans
• Intake manifold end seals and timing covers
• Water pumps and thermostat housings

Who is this for: Technicians, home mechanics, and restoration enthusiasts who need a robust gasket material for high-torque or vibration-prone assemblies will benefit from Permatex Ultra Grey. If you work on engines that experience heavy clamping forces, frequent thermal cycling, or exposure to fluids, this 13 oz cartridge offers a durable, OEM-grade option for creating long-lasting seals without specialized gaskets.