Didn't know you were rebuilding a bike. DynaJet and other blasters advertised are into industrial site/structural/marine services. For motorcylce, you might want to get intouch with a motor body workship who might have access to a blasting chamber. Was many years ago that I engaged services of commercial coatings applicators services for blasting of tanks and vessels. Don't know if they'll entertain a cycle frame. Will quote high. Try the autobody workshops.