Review on Bar's Leaks 1109 Liquid Copper Block Seal Intake and Radiator Stop Leak - 18 oz. by Donald Phi

My '97 GMC truck had an intake gasket that kept leaking coolant until I either had to spend a lot of money on a repair or try it. Somehow it worked. Just prior to using this as advertised, I lost 1.5 gallons of fluid in one leg of the trip (about 35 miles). About 15 minutes after applying this product, the leak stopped. So I drove about 150 miles and didn't see a drop of coolant. I can't say anything about the duration yet, but now the problem is solved!