I have two 26-yr.-old fiberglass tub/shower units that have been blistering with no visible cracks--mostly on the shower surround area--for several years and getting worse all the time. (One tub has a crack on the bottom that also needs repair.) Recently several of the blisters have started oozing small drops of a vinegar-smelling liquid (on one the liquid is amber-colored; the other is clear). Not sure what could be causing this and would appreciate any advice.
Thanks.
Laina
Thanks.
Laina