some of the (porcelain?) has come off.
There are products on the market that allow you to repair bathtub finish to its original shine. It takes patience and a steady hand, but a do-it-yourselfer can fix a chipped or peeling spot on the bathtub before it becomes necessary to resurface the entire tub.
Here is a link to amazon.com where they have tub touch up and repair kits for sale:
Thank you! I'll give it a try.
Hello Salvatore! Here are some very helpful instructions for you! Have a great day!
Note: Your local hardware, Home Depot, Lowe's and Amazon on-line can give you information on the kit you might want to use.