I just did a little google search and it seems glass beads can be found pretty easily. The site I found (in Swedish) claims the glass beads even out the surface like shot peening.
I'm only really talking about the outside of the base so it's not the most delicate parts.
Give it a try just cover all the holes up well. Might want to put the adjustment screws in to be safe that could be a PIA to get out afterward. Got a rebuild diagram?