1) Elmers "Ultimate High Performance" is a Polyurethane (PU) glue and it's as good as Gorilla (another PU Glue) (As far as I can tell) but cheaper. also used the PL brand glue and can't tell any notable difference between the three. Have not used Sumo and from what I understand it sets up faster and as a result apparently has a much more limited shelf life (this is generally not a good thing - see item #2)