I've seen a few CAH's with blisters, but it seemed to be a relatively uncommon occurrence.
Warren Jensen's guess was that it was related to the temperature on the day the hull was laid up.
My understanding is that Gelcoat is not totally impervious, and water sometimes gets through it
and into the roving. The water forms a blister under the gelcoat, and the blisters can indeed
spread, eventually getting through the several layers of roving to the inside of the boat; i.e., a leak.
None of the CAH's I'm aware of actually got to that point.
There was quite a "scare" about blisters many years ago, and many folks (with many brands of boats) dug out the blisters. It was a time-consuming effort, requiring many days of drying before the dug-out areas (blisters) could be filled with resin, and re-gelcoated. With the daily lay-up fees --- often weeks --- it got quite costly. |