Permatex Ultra Black RTV Silicone Gasket Maker Cartridge 10.6 oz — Oil-Resistant, Flexible Sealant

Permatex 24105 Ultra Black RTV is a high-performance, oil-resistant silicone gasket maker supplied in a 10.6 oz cartridge for forming flexible, long-lasting seals on automotive and industrial equipment.

This cartridge contains Permatex Ultra Black RTV, a ready-to-use silicone sealant designed to replace pre-cut gaskets and repair worn sealing surfaces. Formulated for resistance to oil and hydraulic fluids, it cures to a durable, flexible rubber that resists vibration, movement, and leakage at typical engine and equipment operating temperatures. The product dispenses from a standard caulking gun and bonds to metal, glass, and many rigid substrates when properly prepared.

How does Permatex Ultra Black help prevent oil leaks?

Ultra Black creates a continuous, flexible seal that conforms to irregular flanges and mating surfaces, reducing pathways for oil to escape. Its cured silicone remains pliable, compensating for thermal expansion and vibration so the seal stays effective over time.

• Oil-resistant silicone formulation designed for engine compartments.
• Cures to a resilient rubber that tolerates movement and vibration.
• Ideal for replacing gaskets or forming custom seals on valve covers, oil pans, and timing covers.

What surfaces and applications is this RTV compatible with?

Permatex Ultra Black adheres well to clean metal, cast iron, aluminum, and some plastics; it is commonly used on automotive engine components and industrial housings. For best adhesion, surfaces should be degreased and dry before application, and non-porous materials can be roughened slightly for improved mechanical grip.

• Works on metal engine parts: valve covers, oil pans, timing covers.
• Suitable for many rigid plastics, glass, and composite flanges when prepped.
• Dispenses with a standard 10.6 oz cartridge caulking gun for controlled bead placement.

How do you apply and cure the gasket maker correctly?

Cut the cartridge tip to the desired bead size, puncture the safety seal, and apply an even bead to one mating surface. Assemble parts within the product's working time, allow an initial tack time, then let the silicone cure fully per temperature and humidity conditions for a reliable seal.

• Cut nozzle to match required bead width; apply consistent bead along flange.
• Assemble parts before skin-over time; torque fasteners as recommended by equipment maker.
• Full cure depends on thickness, temperature, and humidity—follow manufacturer cure guidance.

Are there limitations or precautions to consider?

Ultra Black is formulated for oil resistance rather than high-temperature continuous exposure; avoid use where continuous temperatures exceed product specifications. Do not use as a gasket on surfaces that require a non-silicone material or where silicone contamination could interfere with later sealing processes like paint or adhesive bonding.

• Not intended where constant extreme temperatures exceed product ratings.
• Avoid use on surfaces that must remain silicone-free for later bonding or painting.
• Clean and degrease mating surfaces; remove old gasket material for best results.

Who is this for: Permatex 24105 Ultra Black is aimed at mechanics, home DIYers, and maintenance professionals who need a dependable, oil-resistant RTV to form seals on automotive engines and industrial equipment. It suits users who want a cartridge format that fits standard caulking guns for precise application, and who require a flexible, durable gasket substitute where pre-cut gaskets are unavailable or worn.