i had them on my old 2005 supra ssv22. the dealer and skier's choice accused me of leaving the boat in the water for long periods of time. i told them it was always trailered and only left in the water for 3 nights while on vacation at table rock. also they blisters were exactly where the trailer bunks were. well since the boat was less than a year old they "skier's choice" repaired the blisters along with gel coat cracks on the deck from the tower.
well the following summer all the blisters came back. this time skier's choice wanted to send the boat back to the factory and break it apart and put a new hull on it. i refused to do that and had them repair the blisters again and sold the boat.