What type abrasive and grit would you try on a truck cab and what pressure, nozzle size ect?
It depends on a lot of things/ preference so its kind of tough to answer. Most people use soda blasting for the outside body because other abrasives can warp & roughen up the sheet metal too much.
I think if you sandblast at a low enough pressure when it just starts to take the paint off, you might be fine with garnet, aluminum oxide, or glass beads. Use at your own risk though.
Other safer options similar to soda blasting are plastic abrasive or possibly walnut shell.
Nozzle size would depend on the size of your abrasive and the amount of CFM output from your air compressor. I have been referencing this air compressor pressure pot chart for matching the right nozzle size per compressor CFM rating.
Different paints and thicknesses of rust vary so start a lower psi and work up until it cleans effectively.
I hope that helps.
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