i buy from canfield and joseph composites. there should be a supplier in your area. not many media shops around. we had to build a booth and hopper for it and you have to have at least 185 cfm. if done right it will knock some surface rust off but we clean up and switch to a product called star blast for rust. we're offering blasting/rust removal with dp90 sealer and lizzardskin insulation. our hope is to take the car from yard art to clean and sealed so it is protected and ready to start on.
you can go online and look for composite sales companies. should bring up a directery of suppliers. let me know if i can help you find one.
try compomat.com