Fiberglass bathtub floor repair question
We installed a Kohler fiberglass tub/shower one-piece in 1977. There are hairline cracks in the floor and we discovered last night that if the tub is filled, that water goes through the cracks and leaks through the subfloor which is beneath a thin cement pad. Taking a shower has never caused this, I guess because the cement pad under the tub was able to absorb the slight amount of moisture.
Is there a product that could be applied to the tub floor to seal up these minute cracks?