Originally Posted by MARTINSR
More often than not it did just the opposite, trapped water that couldn't leave, and rusted the metal. And if you haven't cleaned up out you don't know what is there. You don't plan on sand blasting the body do you? That is a serious NO NO unless you have piles of experience. You can do some SERIOUS damage to sheet metal panels. We are talking throw them away because they are ruined kinda damage VERY easily.
I use a pressure pot blaster at 50-60 psi, never had an issue.