I have seen a lot of painted bathtubs over the last 25 yrs.  Most of these can and have been stripped and refinished by me.  Fiberglass bathtubs and showers that have been painted, can often be refinished just like porcelain or ceramic surfaces.  The reglazing material used by Carefree Koatings is specifically designed for fiberglass showers and acrylic bathtubs.  Call Carefree Koatings today at (513) 829-9091 or visit our website at yourtubguy.com