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Media blasting is great, however it will NOT remove the undercoating and seam sealer. I had my tub primed (by the powder coater) with zinc rich powdercoat primer. This is an etching type of primer providing excellent protection against rust. Speak with the local powdercoater in your area. It's a great option.
Two issues that are a result of of media blasting are: 1. wavy warped panels from high pressure blasting (the operator needs to blast the exterior body panels at low pressure to remove paint etc. and avoid warping the panels) and higher pressure elsewhere. 2. your car will leak the blasting media for a long time. It seems like it never ends!
As for removing undercoating and seam sealer (that is why you are doing this right?) you have 2 choices 1. acid dip the tub or 2. countless hours with a torch and scrappers. I opted for hiring the unskilled-skilled labors to heat and scrape the undercoating and seam sealer from my tub. It will take 25-40 hours to torch and scrape this crap off, then you will find more that was missed! IMO well worth the effort, but a dirty nasty, smelly smoky job! By the way after the torching and scraping you want it blasted again. So, torch and scrape first!
Good luck!
Will
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