[bigeasy1]

I'll have to respectfully disagree with darlene,regarding polyester resin.Most likely,the reason it falied,was not because of the resin,but because of a poor repair job.No resin on earth,no matter how costly,will adequately adhere to a wet or poorly prepared surface.
Try finding any commercially produced boat line,even high end ones made with anything other than polyester,or maybe some vinylester resin.Even some with Kevlar,are still using polyester,vinylester,or some sort of orthothalic or isothalic resins You may find some built with epoxies,but they are usually reserved for exotics,one of a kinds,or race boats.
A repair done properly with polyester or vinylester resin,will be as strong as the surrounding area.as for temp,You probably wouldn't want to glass in temps any lower than fifty degrees or so.To do so could cause the glass to not cure properly,resulting in another failed repair.