Best place to buy fiberglass, resins, and related components is either from a fiberglass supply house, or a TRUE marine discount store. I'm not talking about a place like West Marine or Boater's World, the stuff they sell comes in those prepackages, and are very expensive. The true marine outfitters sell cloth and mat by the yard, and most sell resin in their own house brand gallon cans. As an example, I pay $ 22 per gallon for polyester resin at a real marine store, and the same quality stuff goes for $ 38 at Home Depot and $45 at West Marine...........and polyester resin is polyester resin.
Look in the yellow pages under fiberglass supplies.
Don