When I had my boat hauled after its first full season in the water, the yard (which was also the selling Catalina dealer) noticed an area on the starboard bottom, a couple of feet square, that had groups of very tiny "pimples" in the gelcoat under the bottom paint. The dealer took it upon themselves to contact Catalina, who suspected there might have been a problem with the batch of gelcoat used on my boat. The following spring, they sanded off the bottom paint and gelcoat on the entire bottom, down to the laminate, and found no evidence of blisters or water intrusion or absorption into the laminate. They applied six coats of epoxy barrier coat, followed by two coats of ablative bottom paint. All was covered under warranty, and the only downside was a month delay in spring launching. That was done in 2008, and the boat has been in the water for 4 years (with one winter on the hard) without further problems. In fact, I was hauled 2 weeks ago for the hurricane, and did a close bottom inspection and all was well.