Hope someone out there can help with this! During the installation of a one-piece tub/shower unit a small hole about the size of a quarter was accidently poked through the fiberglass. The hole is located not actually in the tub portion but a little higher where the shelf or soapbar is on the wall part of the unit. Please advise as to the best method for repairing. Hopefully someone knows a way so that the hole will be undetectable. Many thanks in advance. Glo