How can i paint over marble?
I really hope you are not painting over real marble, it will totally ruin it's value and devalue your home
If referring to cultured marble that has a sink integrated into the top your best choice is epoxy paint kits made for countertops sold at home depot. Your biggest issue is in a heavy use area like a bathroom sink it could scratch then peel.
Here are some very helpful videos!
I have marble floors and they are a pain, but I would never try to paint them I think it would give me so much more trouble. I go with Nooooo.