Occaisionally builders contact me offline with questions. Here is one that I thought the Group could answer better than I. I thought it looked like some type of stress fracture. Here is the original text of the question:

Hi Chip,
I am getting ready to start a kayak....I finished a Bob's Special canoe in November but just like everyone else I can't wait to start the next project. However, I have a problem with the glass on my canoe and don't want to have the same problem on my kayak. so I'm hoping that you can give me some advice. I had no problems with it in 15 half day trips. The weather was on the cooler side (65-75 degrees) when it got hotter (85 degrees plus) is when I first noticed the problem. It seems that gas bubbles or something has appeared under the cloth from pinhole size to several inch lines that follow the wood joints. First, I am wondering your opinion on sanding off the glass and re-doing it or do you have any other thoughts?

Second, I am wondering what I need to do that is different on the next project. Do you think that pre-epoxying would help? I used Raka 1-2 mix. I included two pics of the problem.

http://www.chipsandresky.com/cedarstrip/images/conoeprob.jpeg
http://www.chipsandresky.com/cedarstrip/images/canoeprob2.jpg