You can certainly paint over your dip powder nails. If you’re doing it for an event such as a job interview and want to take it off after, that’s also an option. The top coat protects the powder color, so just use a non-acetone nail polish remover to take off any new polish. You may need to apply another layer of top coat once you’re done, to give it some shine, and to protect the color. Just keep in mind that if you’re regularly painting over them, perhaps a less permanent option will better suit your needs. That way you’re not wasting money on a long-lasting color that you’re not using.