What to use for undercoating?

Not really… It's more like factory rust proofing with body color overspray.

But I may be misinterpreting your "properly" with "correctly".


Anyway…….. Eastwood is best for separating a fool and his money. (They are good for those hard to find items).


SEM, M3, Truck bed liner……. All local options at a fraction of Eastwoods cost.