I would seriously have a test on costs and time using the PMB
using a cabinet it can be re-used many times over,no clean up or neutralizing, no fumes and risk of burns.
only thing i found its hard to remove is the baked enamel on the bmw subframes, but then if its good I was only keying for paint over that.
But i was only blasting at 40psi with a large nozzle.
it wont remove rust, will knock down the loose stuff but wont get into the pores.