Permatex Products: Which Sealant, Adhesive, or Thread Locker Do You Need?

Permatex has been making automotive chemical products for over 100 years. Their lineup spans dozens of products — sealants, adhesives, thread lockers, and more. Here's a guide to the most commonly needed products and when to use each.

RTV Silicone Sealants

Permatex Ultra Black RTV (Gasket Maker)

The go-to for making custom gaskets or sealing flanged surfaces. Sensor-safe formula won't damage O2 sensors. Use for valve covers, oil pans, timing covers, and anywhere you need a flexible, oil-resistant seal.

Permatex Ultra Grey RTV

Rigid, sensor-safe, and excellent for applications that need to maintain alignment. Popular for intake manifold-to-head sealing and rigid joint applications.

Thread Lockers

Permatex Blue Threadlocker (Medium Strength)

For bolts you want locked but still need to remove with hand tools. Perfect for fasteners subject to vibration — exhaust bolts, suspension hardware, interior fasteners.

Permatex Red Threadlocker (High Strength)

Permanent strength for fasteners you never intend to remove without heat. Use on press-fit applications, permanent assemblies, or anything subject to extreme vibration.

Anti-Seize Compounds

Permatex Anti-Seize is essential for aluminum threads (spark plugs, O2 sensors) and stainless-to-steel fasteners that will be exposed to heat and corrosion. Prevents galling and makes future disassembly possible.

Dielectric Grease

Permatex Dielectric Tune-Up Grease protects electrical connections from moisture and corrosion. Apply to spark plug boots, battery terminals, and trailer connectors.

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