Mid 80's Blisters
Blisters are specific to the boat and while the cause is still not fully understood, it appears related to quality control (both materials and construction) during the build.
As indicated, you need to look at this specific boat. If it doesn't have them by now, they are unlikely to form. Pulling a boat each season and allowing it to fully dry over the winter definitely helps alleviate or prevent blistering.
Sabre 38 "Victoria"