You might try West epoxy......they have a "repair the fiberglass tub/shower" article Under Projects>Non marine>tub and shower repair http://www.westsystem.com/ The article also explains how the original Gel-coat is first spray applied to the mold.....then the fiberglass backing.....all inside out....... Any "surface repair" needs a cosmetic paint coat...... "...measure once.....cut twice....throw that one away and cut a new one...."
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