Used this to seal the oil pan on my s2000 and valve cover gaskets on my wrx. S2000 oil pan had no other gasket besides Hondabond. On my wrx I applied Hondabond in the valve cover channels where the rubber gasket sits in, a thin layer on the rubber gasket and a thin layer on the engine mating surface. No leaks. Will be buying and using again when I change the tranny fluid on my mazda5 and have to drop/reinstall the fluid pan.