Going to change rear end lube on my bought new 94 F 150 4.9 for first time (110k miles). I bought the Victor Reinz 711481000 cover gasket. It is fairly thick and kind of looks like it may have some cork content. I have some gasket shellac and also some Permatex no. 2 non hardening type gasket sealer on hand. Does anyone have recommendations regarding the use of either of these sealers on the gasket during installation?