Blistering has nothing to do with rocks, scratches or sandbars. By its nature, the gelcoat on your boat is somewhat porous. Water gets into the gelcoat and sometimes causes blisters. Thats why most manufacturer's do not recommend a boat to be sitting in the water for more than two weeks. Do to advances in chemicals, blistering is not as common as it once was. It won't be cheap to fix. I don't know of any manufacturer that warrants a hull against blistering.... that said, they might help out with a good will repair on a new (less than 1 yr) boat.
Call Unique Boat Restorations and ask them if they can go look at it...
Woodsy
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