After spraying this
Dorman 635-100 with DupliColor DE1650, I put some
Hylomar on the (supplied) front main & tapped it in. Then I sprayed
CopperCoat on its block face and stuck the (supplied) gasket on. I laid it on a flat surface to hold the gasket flat while the Copper Coat dried. Another good sealant would have been
Permatex 20539 Indian Head Shellac.