I wouldnt sand blast a car tbh would rather it was chemically dipped and stripped less harmfull towards panels as car panels are so thin sand blasting puts small imperfections against the metal slightly stripping the metal of its strenght witch is never a good thing also sand is a bugger to get all out of the nooks and crannies

If i was to do it (homer job) not including getting it dipped ide do it for 2k including materials. That would be including plastic primer and flexibilizer additive for plastics etc and inside out obv

Ide imagine from a good bodyshop to do this job you would be looking at approx 7/8k atleast dependant on condition of car and also what colour