Why would you make a repair with epoxy when the original lay-up is in vynalester resin and polyester gel coat???
For maximum compatibility and "as new" finish you always use the same materials as the original. If you had an aluminium fitting that was fractured and you had to "repair" it instead of replace it, would you fasten a stainless steel piece to it because the stainless is stronger? I think not as the risk of acute electrolysis would soon create a worse failure (although I've seen people do this with disastrous results) Complete compatibility between original materials and "repair" materials is always the most logical and best method of any maintenance.