I did have blisters on a previous boat but nothing serious. My present boat had a few, maybe half dozen very small ones at the beginning of the season, will be curious to see whats there when its hauled this season.
With my previous boat I was able to get the manufacturer to pay for some blister repair because it was very new. I never fixed it because Unique Boat Restorations in Moultonborough advised waiting a few years for the blisters to run their course & then they would repair them & apply a barrier coat which at the time many manufacturers recommended if you left the boat in the water for more than 2 weeks at a time. I traded to another boat so they were never repaired.
Many times they are only surface blisters that do not affect the structural integrity of the hull but it sounds like yours could be more serious & given the age of the boat I doubt the manufacturer will contribute to any repairs.
Many of the manufacturers are now using much more advanced gel coat materials that resist blisters much better & manufacturers are standing behind the gel coat with better warranties against blistering because of the success of these better gel coat materials.
You will want to take your boat to a reputable fiberglass repairer to assess your blisters & determine the best course to remedy the problem. Back in 98-99 Unique Boat Restorations was charging $100 a foot to repair the blisters & apply a barrier coat to prevent new ones.
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