Definitely let them completely dry before painting, you'll have a mess as well as a longer dry time if you paint them right away.
I always start with gray 50/50 paste, silver is much richer when painting over and if you miss a small spot, doesn't show thru like the white stars. Add to wires first, dry, then paint. lol
The way i did the starts on my football cake was to cut them out of yellow gumpaste and stick them on the "curled" wires with a little tylose glue on the end of the wire. Hung them till dry then painted them with yellow luster dust mixed with a little lemon extract.
HTH
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