Dipping vs blasting

The dipper I talked to out here in CA only dipped. When I asked him about all the boxed in areas and pinch welds that I wouldn't be able to paint, he didn't have an answer. So I went with media blasting.

That's great that the dippers in your area can protect all the metal afterwards but it would need to be a dip to get inside all the inaccessible areas. Remember that Chrysler dipped these cars in primer at the factory.

My car was on a rotisserie so by the time I was ready for paint, all the media was out.

Chrysler didn't prime or paint the boxed in areas before they put the car together or painted them did they? Would it be the same unprotected bare metal?