[nick c]

When I restored my 29 AA, I completely dismantled every piece of cab and running gear, sandblasted, 2k primer and urethane painted then reassembled it. My compressor is JD diesel, 125 cfm and 100 psi. I regulated it down to 60 psi, backed of 12 to 18" at a 45* angle. Some industrial suppliers only carry one size sand like 20/30, that's too course, I use a fine sand that looks the same size as common table salt, I buy in bulk 4000 lb. All my porcelain tip are 3/16" diameter, when they're wore out to 1/4", it reduce the pressure and spreads out the sand. You wont have any problem with pieces like the radiator shell, the problems come with the hood and door skin, do these last. I did the doors in side and out but did not spend much time on them, this is called dusting, I did not have any problems. I don't think the metal stretches because of heat, take a chipping hammer and put a needle point on it and strike the metal a thousand times, its the impact not the heat.
carry on