if you're going to blast, and you probably already know this, but, make sure it is completely disassembled and be sure to blow out all the sand or whatever when you are done, then when you're sure the sand is all gone, blow it all out again.

i sanblasted around my front and rear windscreens several years ago, thinking i had the interior completely sealed and protected. i am still getting sand out occasionally. i even drove it around for a few years with open windows and no headliner, and put a new one in a couple years ago. there are little piles of sand by my quarter window corners right now.
for a while, i'd go over a big bump and have a dash shaped line of sand on my carpet.

just trying to save you from this fate. actually, i'm alot happier with the sand than i was with the rust.