[Bob Mulry]

We always used the GM brown sealer in the can with the applicator attached to the cap....

It looked like Permatex Aviation Form-A-Gasket only thicker.....

Nasty stuff but it worked great on studs and bolts..........

Bob

PS:
Don't forget to add a good block sealer such as Moroso Ceramic Block Sealer or K & W Metallic Block Sealer