Need some advice.... (frame going to powdercoat)

[shifty]

Ok, so I'm good to go on getting my frame ready. Wanted to wrap everything up, but need to ask some questions.

My frame is going off for sandblast/powdercoating. Thing is, I'm bolting in my CPP C-notches (I want to weld, but not skilled enough yet). I don't want things to rust where metal meets metal (notch to frame), so I guess I should paint that area, since it won't get powdercoated. What kind of paint will hold up to a powdercoat oven, or am I thinking about this the wrong way? I suppose I could just use seam sealer to seal it up, but seems like there must be a better way.

I want my trailing arm crossmember and tranny crossmember to be the same color as the frame. They are already powdercoated. Will sandblasting take the powdercoat off those parts so they can be re-powdercoated?

Should I just pull out those two crossmembers completely when the frame goes in for powdercoat, or actually bolt them in?

All of my grade8 hardware to bolt in the C-notches and crossmembers uses poly lock nuts. Will the polyurethane lock material melt out in the powdercoat oven?

Does anyone have additional tips of things I can do before I send the frame off for sandblast and powdercoat?