Sandblasting a Camaro shell

[BuddyP]

Well, original plan was to have it dipped. But now after talking with a local sandblaster I can get my '68 shell blasted for a lot less than I thought. He also is able to spray it with Epoxy primer afterwords. I just wanted to see what anybody had to say about the process or the epoxy primer. Anything I should watch out for or focus on when prepping it for him to blast it? Any need to wipe down the metal before it's sparyed with primer? I can't assume that he will do this.

Any info is greatly appreciated!
Thanks
Buddy P