Does anybody ever use this stuff? It says it's good for exhaust manifold but the max temp of this spray is 500 degrees. Exhaust manifold get hotter than that. Im trying to get a better seal on the header to block gasket and the turbo to downpipe gasket. It's such a small leak that when I start the car on a cold start I can see a couple drops of water come out of the flange. I'm using brand new gaskets too. Would this hold up to the temperature?