J-B Weld Ultimate Copper RTV Silicone Gasket Maker and Sealant

J-B Weld Ultimate Copper Silicone Gasket Maker and Sealant is an RTV (Room Temperature Vulcanized) Silicone gasketing material that is 3 times more oil resistant than conventional silicones and designed to resist the high operating temperatures of turbocharged or high-performance engines. Ultimate Copper is effective in temperatures from -75F to 700F intermittent. Upon curing, which occurs when the product is exposed to the moisture in air, the silicone forms a tough, waterproof seal on most surfaces. It will not shrink or crack, resists weathering, is sensor safe and is great for many automotive applications.

• Three times more oil resistant
• Advanced high temperature RTV sealant adhesive
• Designed for high operating temperatures

• Oil Pans
• Valve Covers
• Exhaust Manifolds
• Water Pumps
• Timing Covers
• Differential Covers
• Drive Housings
• Oven Doors

1. Prepare: For best results, clean and dry surface area.
2. Apply: Apply even, continuous 1/4 inch bead of Silicone to one surface area. Surround all bolt holes with Silicone
3. Assemble: Reconnect parts while Silicone is wet.
4. Secure: Hand tighten until Silicone begins to squeeze out.
5. Dry: Allow drying for 1 hour and then tighten an additional 1/2 turn.
6. Finish: Scrape or cut away excess cured sealant. Silicone will fully cure in 24 hours