prepping for paint

Ah. Ok. I was just reading about people getting warpage using sand blasters (saying it was due to heat and pressure) and thought it might apply to hot pressure washers which can get up to 300 degrees. I think the one I'd rent only gets up to 220 degrees. And since I'm only doing the under carriage and engine bay, any warpage wouldn't really be noticeable (I'm guessing the engine bay gets over 220 from normal use anyway)