Thank you for the tip speedracemtrixie. I was wondering if PVA will work with fiberglass and was about to do an experiment.
Now that I saw your Laser, the idea of building up the "turtleback" similar to yours is planted in my head, but I am keeping my options open. It will be a while before I get to the fuselage and have to make these decisions. unfortunately this is a slow build due to other projects and commitments.

Cheers,
Eran