Post Soda Blasting surface prep

Years ago I had a 49 Merc all chopped and channeled a real lead sled so we got the bright idea to sand blast not media blast the entire body my friend lay down a killer gloss black paint job that looked 20 miles deep and I pinstriped the snot out of it, the car drew a crowd at every show even took it to an few big indoor shows, when ever you slammed the doors sand would come out and fall to the ground, one of the judges slammed the door and look down at the floor, what you guys just come from the beach...lol I always thought it was because we were a couple of dumb kids apparently dumb adults do the same things...:lol:
I've had some brackets sandblasted and some small stuff and again that frame done but I did learn my lesson on this cab. Not only that I gave him all the details of what I wanted blasted and how I wanted it done and they just blew all that off and did a completely half-*** job. Next time I'm just going to use a rust encapsular.. I could have easily bought 6 gallons of rust and capsular and poured it in there by the gallon until the whole damn inner works were full and let it drain out..