Hi Monica, is it just the paint chipping off or is the bathtub actually cracking and leaking?
Rustoleum Tub & Tile repair kits
If it is porcelean, buy a porcelean repair kit. If it is fiberglass, buy a boat fiberglass repair kit.
What type of tub?
If your tub is painted steel, iron, or some other metal alloy, you can weld or have welded the cracks in the tub. If it’s the paint that is cracked, and not the tub, you can use a bath or sink repair kit available at any home repair store. If you prefer to have the tub completely repainted, you can use 2-3 kits or hire a professional. This layer seldom lasts long, but it looks pretty and shiny for awhile. Best wishes! 😊
Home Depot sells a bath tub redue kit
If your tub is cracking due to flexion when you move about in tub, it was not manufactured or installed correctly. Some tub compositions lend themselves to this problem, more than others.