glassfibre comes either in a chopped strand mat or a woven material. When you use it, you either bond it in place with polyester or epoxy resin [Vinylester is an in-between]. the older boats like the 14 will be built of polyester resin, so that is the best one to use [especially if you want to finish it with gellcoat]. Epoxy built hulls have to be painted instead of gelcoated - like the tornado.
If you have damage during a regatta and need a fast strong patch repair - use epoxy.