I'm thinking of purchasing an '86- Hunter 23. The current owner has had the boat for 10 years. He's told me that it has 10-15 dime size blisters that it had when he purchased the boat from the first owner. He says that they have not gotten any worse since he's had the boat. Is this a serious problem? Or is it something I'm going to find on most boats this age? Can they be repaired? I'm going to look at the boat tomorrow but won't be making any decisions without a little more investigation. Thanks Mike Knight