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Hi Art,
5200 is probably not the best material for this application. I would favor an Epoxy filler. West Systems is arguably the best product on the market and available at most good marine stores. I checked online and found a great PDF file you can download with very detailed directions on how to apply and which of their products to use. Click HERE to download the PDF. The link in case you need it is http://westsystem.com/ss/assets/HowTo-Publications/Fiberglass-Boat-Repair-and-Maintenance.pdf; you will find what you need in Section 2 of this document. You'll probably also want to save this PDF because it is loaded with information for future repairs.
Happy repairs,
Captain Ian Fagg
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