If it's cured i.e. aged lacquer, & a reasonably thin coating, then a very fine glass bead media would remove it at lowest possible pressure. If enamel, blasting is more difficult, since it's not as brittle as lacquer. But that metal is slow thin, warpage/distortion is likely, unless maybe you blast at a shallow angle.
Better to get some lacquer thinner & 0000 steel wool & scrub it away. 0000 wool works nice on anodized stuff.