Valiant Blister History?
As I understand it the problem was with the fire retardant resins. The standsard cure that is supposed to work is to do a peel to a solid layer and to build the hull back out with cloth and vinylester resins (or epoxy resins). It is a big job because it also affects decks and topsides requiring a major peel job and a lot of glass work. Left undone it can become structural. ( I have seen a Valiant in Florida that had more holes than hull where they had sand blasted away bad glass. Most cases are not supposed to be that extreme but I have seen a Valiant Esprit 37 that had terrible problems with blisters at the deck and cabin and these would have been structural if not corrected.
There is a Valiant site that has a lot of info on this stuff but my bookmark is no longer valid. You might also try Bob Perry, <firstname.lastname@example.org> who designed the Vailant.