button alteration?

[the-lady-tim.livejournal.com]

okay I'm making a cosplay outfit for otakon and I need flat plain silver buttons... I wasn't able to find them but I found what I need in gold. I can paint them silver but the surface is too smooth even after sanding it a bit so the paint scratched off. Anyone have any ideas? would it work if I put modpodge over top of it? thank you so much for any help you can give!