We have a vinyl bathtub insert imbedded in a polished concrete surround. The vinyl has cracked (10 years old) and is pretty pricey to replace (also difficult to find one that fits the hole).
We contacted American Standard (manufacturer). They do not sell repair kits nor recommend such tubs be repaired (not a surprise).
We were thinking of pulling the vinyl insert and having the interior finished in polished concrete.
Has anyone had experience with a polished concrete tub? And, who in this area does them?