Hi Harvey, To answer your question, yes, there were very different quality of resins used in boat building. When I bought my Tripp-Lentsch 29 in Holland in '66, fiberglass boats were in their infancy, and nobody really knew what the stuff could do or how long it would last. The major reason I went with the Tripp-Lentsch, rather than a conventionally built wooden boat, was that the shipyard, one of the big three of Europe whose specialty was building expensive yachts (their competition was Camper & Nicholson in England and Abeking Rassmussen in Germany) had used Fokker Aircraft as a consultant on their fiberglass work. Twenty-six year later, when we sold the boat, there wasn't a blister to be seen anywhere. By comparison, I bought the big brother of the Tripp-Lentsch - a Northeast 38 - in 1985 that was built by a different Dutch shipyard at about the same time, '66. When the boat was hauled for storage, after we had sailed it around the Danish Islands, I got a phone call from the man that was going to do an Awlgrip paint job, who said the hull was pockmarked with blisters. I asked him to repair everything. So, two different builders: same time frame; one with extensive blistering, the other with absolutely none. Connie