Painting / resurfacing ceramic tile in bathroom

[Mike Bryant]

Hello, I am researching my options on a old bathroom that has some ceramic tile from the 1950's - installed on a lath& plaster wall with a 1" "mud wall" behind the tiles. They DO NOT want to come off. The bath has a nice "retro" look with a blue-and-white tile floor, white 4 x 4 standard wall tiles and light blue bullnose trim along the top. Textured, plaster walls above the bullnose painted blue. Want to prevent completely gutting this bathroom - house will be a rental/lease-purchase. House was built in 1940. Any suggestions on product / application tips for NOT destroying this bathroom would be appreciated!