Yes, I refinished my old cast iron tub using something called "Tough as Tile"
or something like that. Well I was very careful to follow the instructions.
When I was done, the finish looked good, white and glossy. The finish only
lasted a short time though. It seemed that it couldn't take being submerged
in water (taking a bath). After a while, the finish would chip and peel along
the bottom of the tub.