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If the blaster knows what he is doing, the panels don't warp.
The trick is not to use grit, but fine river sand & work the panels at an angle & move around the car frequently so that individual panels don't heat up & any heat generated from the blasting in general can dissapate. Too much localised heat = warping, as does a direct frontal assault with the blasting hose, hence to blast at an angle.
Of-course-the-blaster-must-know-his-stuff - mine does, 20+ years in the game & all my panels come back straight.
Ciao
Greig
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