When rebuilding my pig, I bought a non-OEM gasket kit online. I wouldn't do it again, but regardless here I am. So the cylinder head gasket and cylinder head cover gasket are both 3-layer metal gaskets. However it appears from the old ones I took off that there was some kind of coating on them (maybe silicon?). Is this a coating you're supposed to add to the gaskets? Should I just scrap them and buy OEM (i'm reluctant because I live 3 hours from the closest dealer and have had many problems with them)?