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Here's an attempt to repair a hole in fiberglass. This is in a bathtub, but the same type of repair should work for some other fiberglass items. This product is best for horizontal surfaces, not vertical. Find on Amazon:
US: http://amzn.to/1lYtXjc
Canada: http://amzn.to/2etrrTL
UK: http://amzn.to/2dYYauU

Devcon Epoxy Bathtub Repair Kit is the product I used.