The Gel coat is normally a finish coat laid INSIDE a mold which then has sucessive layers of cloth/mat/tissue or whatever intersperced with polyester resin. Colour pigments can be mixed in with the Gel coat to give a gloss, coloured finish. In the event of not having any specific Gel coat resin, Pregel Paste can be mixed with the normal polyester lay up resin which gives a Thixotropic mix. If you have to "Repair" a Gel coat, as Mark (Vintage) has stated, the surface stays sticky for a long time UNLESS you "Seal" the coat with clingfilm to let it go orft (Excludes the air).
Polyester type resins tend to be more brittle than Epoxys but you need to heed the warnings of reaction to the different chemicals on the human operators at the toy manufacturing stage.
Don't know of the "New" suppliers, but Strand Glass always filled my needs when trying to get stuck up, molding Fugesalges for toy gliders
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Regards Ian.