I haven't done it, but I know that in addition to a paint there is also a type of liquid enamel covering that I've been considering for my (awful) tub. Theoretically it's supposed to leave a nice glossy finish.
"...for the happy heart, life is a continual feast. Better to have little, with fear for the Lord, than to have great treasure and inner turmoil." Proverbs 15:15b-16 NLT
The pessimist sees difficulty in every opportunity. The optimist sees the opportunity in every difficulty.--Winston Churchill