How do I paint a bathroom sink?

I would buy a new sink that is for sure going to be less expensive then enamel you will need to get to do that

Agnes is right. Composite material sinks are very reasonably prices... and you won't have the hassle of paint or the upkeep of a painted surface.

If you have a porcelain sink, I think Agnes and Nan may be correct. However, if you have a laminate sink/countertop, this may help: https://www.diynetwork.com/how-to/rooms-and-spaces/kitchen/how-to-paint-a-bathroom-countertop

https://www.hometalk.com/search/posts?filter=paint%20bathroom%20sink

https://homeguides.sfgate.com/paint-white-bathroom-sink-39595.html

Hi! Epoxy is a great way to go! And can be used over your existing bathroom countertops.

Here is a tutorial!

https://www.youtube.com/watch?v=AnL-B4ulWPk

I would purchase a kit from home improvement store.

I would clean well and then prime and paint.