I have been considering a ply on frame spira dory and have been looking at blogs on line about dory building. One builder has been using PL adhesive (polyeurethane I believe) and was wondering if it can be used instead of epoxy for frame building etc. The builder also glued the plywood skin to the wood frames using PL. Is that a big no-no? I thought the frames were best left un-glued. Thanks for the help.