B-mac I have done a bunch of sandblasting on trucks for the old man behind me - mostly vintage military type stuff. If you want a real nice finished product keep in mind that you will have sand everywhere (EVERYWHERE) and will be using a spray gun blowing air to apply paint. This will pick up any sand you may have missed and deposit it into your fresh paint. Just keep this in mind when choosing.
I'm doing my own 52 and found out the hard way. All those ribbed channels will hold sand for a long time unless you really work it out. It is fine once cleaned but sucks if you don't.
Good Luck