Beware of any fiberglass company that agrees to cover concrete coping
with fiberglass. It indicates they don't know what they're doing, or
they don't plan on being in business for long.

Coping stones move, allowing water to seep-in between the fiberglass
and the concrete coping. This, in turn, allows water to get between the
fiberglass and the wall of the pool. Thus, delamination begins.

This is a major cause of the horror stories about pool resurfacing with
fiberglass.