Recommended paint markers for bright drone frame colors
I highly recommend Edding Industry Paint Makers (The 8750 ones specifically) for painting frames. The colours are very bright and it will stick to almost anything. They are a bit on the pricey side for a marker, but totally worth it.
They do not smudge once dried, it turns in to a hard smooth layer. It does not peel off unless scratched, and it is an quick fix if it does. I think adding a layer of nail varnish might make it more resistant to damage, I might give this a try.