Re: Full Keel
The other nice thing about vinylester/glass matrix is that is more impact resistent and does not get a brittle or prone to fatigue as polyester.
Based on research that I have read, blister problems were at their worst starting in the early 1970s and dropping off considerably by the end of the 1980's. My understanding of the problem was a manufacturing process change and reformulation that occurred due to the oil embargos of the 1970's. The earlier resins were less prone to blistering, but they were far more brittle and prone to fatigue, so pick your poison.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay and part-time purveyor of marine supplies