I looked at an 84 Catalina 27 today and the broker informed me that this past summer the owner had the boat hauled and surveyed, which resulted in 5 blisters found. The owners then had them ground out and filled. The broker told me all was well now, and if I make an offer I will have a survey done. But I wonder, is this indicative of a larger problem, or more blisters in the future at least? Or is it normal for a boat of this age?