I have some of the 3M #77 which I used as contact cement for the vinyl top. Not sure how you could spray it on a gasket and not function as a sealer. Anyway a google search showed a 3M doc. that said it can be used on water pump gaskets. I think it should work ok. I want to bond both gaskets to the metal pan first, then install it at final assembly.

I just bought the gasket set, no sealer was in the box.