My view: Blasting for me means shipping it out, I don't want to do that if can be avoided. Careless blasters can put dents in the middle of larger areas.
Yes, grinding does scratch the metal, and you have to careful at corners and bends. And move around, don't overheat.
About the heavy primer needed, well if you think that your metal on a Pantera can otherwise just be primed and painted, that's in very few places the metal is straight enough. I always cover the entire car in what we call spray-filler, don't know the translation. All that said I will go over the whole car with less coarse paper, to remove the worst imperfections.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.