I prepped the surfaces well. sanded with fine grit, then cleaned with solvent.
No, mine didn't come with any sealant. For the edge sealing I'm going to, as I've done before, use high temp silicone red gasket maker. Prior experience using this has shown me it is an effective protectant for the edges of the pad.
The engine oil pan pad, by virtue of its location, is well protected from the worst elements and would not be easy to get the sealant on it without removing the skid plate, which I am not excited to do.
Mike