We use plastic/low psi blast, and/or aircraft stripper.
Solid areas, such as door jams, trunk opening lips, firewall,rockers, core support, door edges, are done with lowered psi and Dupont Starblast.
Large, "floppy" areas, such as door skins, hoods, trunk lids,1/4's, roof areas, are all stripped w/ stripper. In NO CASE do we use pressurized blasting on the undersides of areas such as hoods, trunks, etc.
Once all stripping is done, we go over the entire car w/ 80G and a D/A. The entire car is then wiped down w/ a scotchbrite and MUST FOR RUST rust inhibitor. [HD@$8.00a bottle.] As long as the car is in dry storage, the MFR will protect it for up to a yr.
As we work each panel, such as hood, trunk, doors, we first go over the area w/ prepsol cleaner, then the D/A w/180 on it. Another wipe w/ prepsol, and the panel is sprayed w/ DP 90, etc. The panel is then ready for body working.
Works for me....