Next time I will blast a car I would strip the large flat panels by hand (sanding discs/stripper etc), then deliver it to get soda blasted. There is a guy at Yatala but I think he just sold his business so before the next bloke takes over, you may need to contact another operator who I think works from the sunny coast. If you check
www.sodablast.com.au you should be able to click onto the "local sodablaster" link to get in touch with someone. The bloke from the sunny coast is mobile and can do it whereever, but you need space etc for him to do it.
obviously do your research first as to which media you'd like to be used on your bus, but having my ragtop beetle doors warped by a sandblaster who "was highly experienced in automotive work" and guaranteed it wouldn't warp.....I will be using soda most likely in the future. Only downside is it doesn't get rid of rust, so I think a combo of both would work (for my situation).
Al