ARP-1009904 Thread Sealer 50 Ml , 1.69 Ounces, Gray

Excellent product , great sealing capability.

Would as it supposed to with ARP fasteners

Seamed to work as directed.

Awesome product! The ONLY thing I will use when building a motor that has bolts that penetrate the water jacket!

This is the best thread sealer for automotive application. I was replacing the coolant temperature sensor for the 2004 GMC Envoy 4.2l I6 Atlas engine (one of the smoothest idling GM engines). I ordered the factory part from GM and changed it out. The next day I noticed a coolant leak. The factory part comes with white thread sealer, dry, on the threads all ready for installation. However, the sealer was not working as it should. I removed the part and did a visual inspection. I did not see any issues with the threads. I did chase the threads to make sure there were no burrs. Then, I put this thread sealer on the threads making sure I only covered the same area as the factory thread sealer. You don't want to cover all the threads as you will lose a the electrical ground connection. After installation, watched for leaks every day for a week. Problem solved!

Never thought a thread sealers worked but this one does.

This product is for water jacketed bolts. It says other applications such as fuel, natural gas and water. Someone else complained it doesn't dry, lol it's not supposed to. It says so on package. I use ARP bolts on my SB Ford so it's a must for warranty. You can use on water pumps also if water jacketed. Use fastener assembly on non water jacket bolts.

Tried using on aluminum NPT threads, and leaked gasoline. Never know whether to use sealant or tape, in this case I used tape, and it sealed.