[MP&C]

.....in addition, much of the sand media products will also contain caustic salts, that may start the rusting process right under your fresh new paint as their residue is left behind.


To clarify, sandblasting "heat" does not cause the warping. Media that is too aggressive and applied using too much pressure will act to peen or displace the metal surface, just as if you are hitting the panel with millions of tiny hammers. It is this action that causes the heat as a side effect. By the time you see any appreciable heat buildup, the warping has long already occurred. You can sandblast and warp with no heat buildup at all.