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Someone just asked about this in another thread recently, and I suggested a few ideas. Oddly enough, I just hard recourse try one of them, and it worked like gangbusters.
It's really simple. Just use masking tape to cover the side of the hole you care about (cosmetic, flush surface, etc) then get some JB Weld steel reinforced epoxy, mix up a little on a paper plate with a popsicle stick, and apply liberally to the other side of the hole. Let the epoxy set/dry, remove the tape, and now you have a nice flush/smooth surface to paint.
Incidentally, I recommend buying a 6 roll of the wider 2" masking tape. I used it all the time during the build, still do. You can write/draw on it, protect nearby paint while working with power tools, and even provide some very basic temporary arc/shock prevention (e.g. working with live battery terminals; bunch up a piece and stick it to the terminals so there's a physical gap/padding between your metal wrench and the terminals).
Many people, myself included, just use white gloss rustoleum (or whatever color approximates your van color) from Home Depot. It's worked well for easily a few hundred small holes I've intentionally made here and there. I just used some today during the Sussex hook lock install. Good stuff.
Cheers.
