|My brother likes to make model cars. To paint them he uses these small bottles of Testors paint. It is car enamel and lasts better than nail polish. You can paint zipper pulls, grommets, rivets, etc... Fingernail polish scratches and chips easily, so if you want to wear something multiple times the Testors is a more permanent option. The bottles cost about $1.15. They also make paint pens for precision painting (~$3).