DanCooper: I read through your sawtooth build and it looks great! I actually was looking at it when trying to decide on if I wanted to go with the sawtooth plans a month ago. I really liked them but wanted something that sat down between the wells for a lower CG. Now I am also worried about potential mold after seeing the crap you went through before yours was sealed!
Thank you! Yes, the mold problem was my fault for not putting a finish on all of the interior. The side walls were finished with three coats of wipe-on polyurethane, and they were fine. The raw wood was what the mold grew on. No raw wood left inside there now!
You are doing great on your double build. I was hoping to see a "Poor Man's Fiberglass" on your build, but I understand the decision to go with a different finish. I have only seen one build thread with paint on canvas. The builder was happy with the result, but I'm wondering how it has held up over time.
It just struck me that having already put some coatings on your plywood that CPES might not penetrate. You may want to consider just rolling on some epoxy, scuffing it, and rolling the Monstaliner on top of that. I would call them and ask if that would be sufficient. They also sell some primer, but it looks like it is for metal.