I just had a new wood deck install on to a Raysoncraft 20 foot flatbottom. The person that did the deck work was also going to paint the cap and joint seam whre the deck attaches to the sides of the boat. Well for the reason he gave me ( boat was too long to fit into his paint aera.
So I got the boat with the cap and sides primed by him.
When I got it home I got it painted. Cost me $2200.00. Now I see where the deck is attached to the sides a blister looking budlge at the seam .
There is also blisters & bubbles on the top of the cap were it looks like screw are under the paint
I talked to the guy and he said it was a paint problem with the primer.
I told him I did not think so because if I had a primer paint problem it would show all over the paint, not just along the seam.
I found some glue that had run on the inside of the boat at a seam. I looked like Gorilla glue.
When I asked about the glue the person told me that he had been using this glue for years.
What it looks like is that the glue is expanding and pushing out.
The seams were glassed with mat and then a layer of cloth.
Maybe he sanded to close to the wood?
Can't help with the pictures. I have a terrible time as well.
In regards to the boat, I'm sorry to hear this. Gorilla glue I'm going to say is the issue. I'd never use it for building these boats in that particular area. It's so expansive & id be willing to bet it's creating the issues.
For the right application, it's great glue. But in this intended use I certainly see where it would create problems.
I have the same problem with my '67 sanger. I used the wrong primer/sealer before painting the top coat. It only has bubbles form along the cap to hull seam or there about. If I don't catch it in time the bubble will grow in any direction is wants to.
When I ordered the primer I told them I wanted a primer/sealer for fiberglass. This was 8 years ago and I've learned a lot since then.
I use a Polyester catalyzed or better yet Vinyl ester catalyzed primer now on everything. Duratec is the best in my book. No more bubbles!!