Almost all hot tubs have a colored acrylic skin heat-vacuumed over the fiberglass shell. Small Blisters and superficial fissures on the skin are more of an aesthetic issue than a real problem.
Usually the blisters are in the corners on the floor, so you can’t see them unless a hot tub is empty. They don’t effect the structural integrity of the shell and when the tub is full of water, nobody notices. But they are annoying
Crazing usually takes place at or above the water line. Crazing and fade are most common on metallic/pearlescent shells. Often you can’t see this damage when the shell is wet, but it becomes evident when dry.
We usually avoid hot tubs like this but if a hot tub is in otherwise very good condition, we might bring it to our shop as an option for people who don’t care about cosmetic perfection.
