...hold up...Liquid Nail will probably not stick to FRP call/search 3M and get their view of what you are wanting to do....I'm thinking POLYSEAMSEAL but I could be incorrect....it has to stay flexible and never harden....also a 2 part epoxy might be better....scuff the surface to be glued.....it also needs to be pristine. Run electric up through floor with SO chord etc...ceiling only needs to be 2.5 inches thick if you use foam board like SuperMaxx/R-MAXX or one of the polyisocynates with aluminum foil on each side....geofkaye
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