My youngest brother sells and repairs very large and very expensive German built +30,000 psi water dustless blasters used to prep US Navy warships and commercial Cruise ships for barnacle removal and external hull repainting.

First installation is at Portland OR dry dock but US Navy wants them everywhere to get rid of slag dust exposure to workforce and its costly much more rapid decrease in steel hull thickness. Especially submarines.

Great for big boats, but does not seem right for automobile undersides.