ebb, I have used Larch resin in aritst's oil paint formulations for restorations and to imitate the quality of old master oil paints, it seems that this natural resin plus others such as Canada balsam are very nealy the same as acrylic resin (spectographicaly). When I replaced the stainless steel rub rail I filled the many gaps in the seam where the hull meets the deck with West System mixed with filler for strength. My father who worked for Rohm & Haas thought that some of thier resins would last as long as amber with the same rate of discoloration or yellowing. When I repaired the hull on my boat the inside of fiberglass seemed like new, I bet these boats will last beyond our imagination and be used by who or whatever is around then, maybe fishermen living in mud huts along some shoreline that dos'nt exist yet, Ocean front in Kansas City.