Sand Blasting Cab questions

[abadsvt]

By the end of August i should have the cab all done with major bodywork minus the custom dash. I was hoping to have it sandblasted to get all the old paint off plus see if there is any other damage to the cab. I was a little worried about all the sand getting into the cracks and not ever getting out. Has anyone experience this? Also do they usually primer the cab or do they give it back and I primer it? If i do primer it what kind of primer should i use as a base since i still have to do bodywork. I used to use an expoxy primer but wasn't sure if there is anything new and better. One more thing. What does it normally cost to have it sandblasted? Thanks Josh