if one has a working horn and wants to blast it, stuff an old sock or shop rag into the opening, far enough in so the new paint will be visible, but the internals will be protected.
this may, or may not work. just tossing it out there.
beer
Good idea. Anything to keep the crap out of the horns will work. Any media blasting dust gets through the smallest openings so before blasting. ANYTHING to make sure it is SEALED. Duct tape is generally pretty resistant as long as one does not BLAST DIRECTLY at it. Do keep in mind with horns they are two pieces with a gasket, so I would either avoid the area they join together or blast the edges at an angle
