To answer your question: Yes car paint will work on yoyos. It will just mask the gouge and not really fill it in. You could sand the roughness out and build up the paint but it’d be pretty time consuming. I’ve done touch ups like this and they turn out alright. Nail polish will work too, you can brush it in and build up layers, wet sand and polish, etc… If you’re up for the work you can hide the blemishes well. If you don’t want bare metal showing, a little touch up won’t hurt anything.
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