Permatex Ultra Black RTV Silicone Gasket Maker 9.5 oz PowerBead — Oil-Resistant, Sensor-Safe Sealant

Permatex 85080 Ultra Black is a sensor-safe, oil-resistant RTV silicone gasket maker that cures to a flexible, OEM-grade seal for engine and drivetrain applications.

Built for modern vehicle materials and dealership warranty standards, this 9.5 oz PowerBead can delivers a fast-curing, low-odor gasket compound that bonds to oily surfaces and resists common automotive fluids. Its patented adhesion system keeps seals flexible across a wide temperature range while remaining non-corrosive and safe for engine sensors. Whether replacing valve cover gaskets or sealing transmission and differential covers, the formula is engineered to meet OEM performance expectations.

How does this gasket maker hold up against oil and drivetrain fluids?

The Ultra Black formula is formulated specifically to resist engine oil, transmission fluid, gear lube and coolant, maintaining a reliable seal where fluid exposure is constant. Its chemistry prevents softening and breakdown, preserving torque and preventing leaks under repeated thermal cycles.

• High fluid resistance to oils, ATF, gear lubes and coolants
• Maintains flexibility to absorb vibration and thermal expansion
• Designed for long-term torque retention in bolted joints

Is the product sensor-safe and compatible with modern engine components?

Yes — Permatex Ultra Black is non-corrosive and safe for use near engine sensors and new component materials like aluminum and high-tech plastics. It was developed to meet OEM specifications and to satisfy dealership warranty requirements where RTV silicone use is permitted.

• Non-corrosive, low-odor formula safe for sensor-equipped engines
• Approved for OEM-level applications and warranty compliance
• Bonding system works on alloys, composites and plastics

What surfaces and parts is this gasket maker best suited for?

Ultra Black is versatile for typical powertrain sealing jobs: valve covers, oil pans, timing covers, intake manifold end seals, and differential covers. It eliminates the need for pre-cut gaskets in many locations by forming a custom-molded seal that fills irregularities and resists leakage.

• Valve covers and oil pans — molds to uneven surfaces
• Timing covers and intake manifold end seals — flexible, vibration-resistant
• Differential and transmission covers — durable under fluids and heat

How does it perform across temperature extremes and during long-term use?

Designed for demanding automotive conditions, this RTV handles temperatures from -65°F to 500°F intermittent, maintaining elasticity and sealing capability through repeated heating and cooling cycles. The fast-curing profile reduces downtime and accelerates reassembly with a dependable cured gasket that resists cracking and shrinkage.

• Wide operating range: -65°F to 500°F (-54°C to 260°C) intermittent
• Fast cure reduces wait time for reassembly in most service scenarios
• Retains flexibility to prevent brittle failure over time

Who is this for? Automotive technicians, home mechanics, and service departments who need a reliable, OEM-specified RTV for powertrain and engine sealing will benefit most from Permatex Ultra Black 85080. It’s suited to shops that require sensor-safe, non-corrosive materials for warranty-compliant repairs, and to DIYers tackling valve covers, oil pans, and other fluid-exposed seals who want a durable, flexible gasket solution.