The Harmony Fiberglass Patch Cloth is made of woven 10 oz. fiberglass cloth suitable for just about any type of structural repair on composite hulls. Woven fabric provides added strength and rigidity compared to mat-type fabrics.
Fiberglass patch cloth worked pretty well on my step. There is really little you can do to repair the steps when they crack but I have been using the repair putty suggested by the pool companies. It works but does not last long. This one is hanging on and keeping the cracked area closed.