Maybe I did not articulate what I was trying to say that well. I still use epoxy for any joints that will require extra strength such as firewalls, landing gear blocks, wing joiners, etc. The polyeurathane is mostly for sheeting foam cores or areas where the foaming action of the glue will compensate for edges that do not exactly fit flush and where this type of glue will benefit the project. For assemby of built up wings I still use CA glue in thin, medium or thick with accelerator. Sometimes if I know that sanding will be required I may opt for the polyeurathane or elmers wood glue as it sands alot easier like when gluing sheets together to make a wing skin. I guess it is whatever preference you as the builder are most satisfied with. I'm sure that by next year there will be something new on the market that is better or stronger, or easier to use.