The old time Gasgacinch (I think that is how it was spelled) was yellow, kind of like 3M weatherstrip glue. I think the Permatex should work ok, just don't overdo it. Watch for the gasket extruding while you torque it down. If it does, use something else.
2013 GT Premium, Red Candy Metallic, Brembos, Auto, GT500 Axlebacks.
SOLD! 2008 GT Premium, Vapor Metallic, 5-speed stick w/MGW, Ford Racing M6066 Whipple S/C, 3.31 gear, GTA's. GT500 front end, spoiler, suspension and wheels. Sequentials and one touch. - can't wipe the smile off my face.