if you notice my avatar it's a picture of the wagon,it's the only way I could load it,I am sanding to the medal,then I wipe it down down with some kind of acid tone this guy told me to do, spray that greenish sealer, which seeems to be working fine,I want to do the whole wagon like this, it will sit like that all winter, then do I have to spray cah just paint when I'm ready or do I have to spray the epoxy primer as a must before I paint?