just to clear a few thing up about sandblasting
we use coarse grit and i have blasted quite a few cars with this stuff it does not take steel off you panels unless you keep blasting the same panel after you have already taken paint, etc off (and mind you, you would have to sit there for an hour on the one panel to make any difference to the thicknes)
sandblasting may warp larger panels if the person blasting it doesnt know what they are doing
YOU WILL most defiantly warp the bonnet if it is blasted i have blasted one and not warped it but it took longer then blasting the whole car! much quicker to paint strip it
your car will put on 50-100kgs due to sand getting into the sills etc. you wwill have to blow it all out other wise it will get water in there and rust out plus in 5 yrs you will have sand coming out of everywhere
you dont have to really turn the pressure unless its for huge weak panels
if you take your car to the blasters and they say they can do bonnets get the f*ck outta there asap
if anyone in the sydney or country area wants a car blasted properly pm me