Jason. Sand back around the blisters and dry out completley,then re coat with some flow coat or epoxy. What you have is some osmosis in the flow coat, and this is not serious as long as the laminate is not soggy.
Many thanks Rob, I thought as much but it is a huge relief to have it confirmed by someone with more expertise than myself. The laminate is sound. The blisters are filled with strong-smelling liquid and I have cut the top out of the tank to get to them.
Thankyou for designing such a great boat, it's a credit to you.