Permatex Ultra Grey Rigid High-Torque RTV Silicone Gasket Maker, 13 oz (6-Pack) — oil & vibration resistant

Permatex Ultra Grey Rigid High‑Torque RTV Silicone Gasket Maker is a heavy‑duty, OEM‑specified sealant engineered for high‑torque and high‑vibration engine applications.

Built for vehicles and equipment that put extreme stress on seals, this 13‑ounce formula delivers a stiff, vibration‑resistant silicone gasket that stands up to oils, coolants, and common shop fluids. The non‑corrosive, low‑odor compound cures to a firm gray gasket that meets or exceeds manufacturer performance requirements and tolerates temperatures from -65°F to 500°F (intermittent).

How does this gasket maker handle high‑vibration and high‑torque engines?

Ultra Grey Rigid is formulated to resist the repeated flexing and shear forces found in high‑torque engines, especially many import powertrains. Once cured, it forms a rigid sealing bead that reduces the chance of extrusion and seal failure under vibration.

• Rigid cured state prevents gasket creep in torque‑intense joints
• High shear resistance minimizes leakage on vibrating surfaces
• OEM specification compatibility for many import applications

What fluids and temperatures can this RTV withstand?

This silicone gasket maker offers broad chemical resistance against engine oils, coolants, and typical shop fluids, maintaining integrity during regular service conditions. It also resists degradation across a wide temperature range, making it suitable for under‑hood and near‑engine sealing tasks.

• Temperature range: -65°F to 500°F intermittent
• Resists oils, antifreeze/coolants, and common maintenance fluids
• Non‑corrosive formula protects mating surfaces

Where should I use this product on my vehicle or equipment?

Designed for multiple engine sealing points, this gasket maker is ideal wherever a rigid, high‑strength silicone bead is required. It performs well on both metal and composite surfaces used in modern engines and drivetrains.

• Valve covers and oil pans where vibration is high
• Intake manifold end seals and timing covers
• Water pumps, thermostat housings, and similar service areas

How do I apply and cure Permatex Ultra Grey Rigid RTV effectively?

For best results, clean and dry mating surfaces thoroughly, apply an even bead, and allow recommended cure time before reassembling. Avoid contaminating the bead during cure and follow manufacturer torque specs when tightening fasteners.

• Clean surfaces of oil, dirt, and old gasket material
• Apply continuous bead and assemble within recommended time window
• Allow full cure per instructions before exposing to fluids or full service

Who is this for? Permatex Ultra Grey Rigid High‑Torque RTV is aimed at professional mechanics, restoration shops, and experienced DIYers working on high‑torque or high‑vibration engines—especially import engines and applications where a firmer, long‑lasting silicone gasket is required. It’s a practical choice when OEM level performance and resistance to oils and coolants are priorities, or when traditional preformed gaskets are impractical. Use this 13 oz. pack of six to stock your shop or complete multiple vehicle repairs with a single purchase.