My slant on the good advice from above. Some surfaces cry out to be precoated others not so much. I am not sure what you mean by flo coat but I think you want to apply the epoxy in as thin a coat as you can force yourself. It is possible but difficult to apply epoxy too thinly ,very easy to apply it too thickly. I prefit many pieces mark where they will be bonded and then precoat only selected areas of the panel, thus avoiding cold joints.