Yeah, I haven't done too many because I don't want to ruin (what little value) they may have already have. But here are a few I've done:
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loginI use metallic paint instead of glitter (because that's what I had on hand), but I don't thin it like I do with regular acrylic since there should be glitter texture. It's not a perfect match (you can see the left side of the sun is a little too smooth silver), but it only really shows from certain angles or in certain light.
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loginThis one was bald and her symbols were half-gone, so I wasn't worried about messing up.
I don't think I sealed the glitter/metallic symbols.
I also touched-up a Baby Heart Throb, using thinned artist acrylic and mod podge sealer, but I can't seem to find a picture to show you how that turned out. You'd want to thin the paint to an ink-like consistency (not too thin, or else it will run/not dry well), and use a very small brush. I just paint over whatever's already there (so the rust in the one above, I just painted over it. Might not be the best idea, but it helps me make sure I have the shape right.