How to redo a bathroom basin, not the counter.
There are refinishing kits you can purchase at the local hardware store.
It depends on what it’s made of. Is it porcelain? “Cultured Marble”?
Painted heavy use sinks won't hold up. Will peel once scratched but the epoxy kits hold up longest to allow time to save up for replacement.
I used a Rustoleum kit to redo my kitchen sink. Click on my name or the picture next to my name and it will take you to my post.