I need to glue two pieces of wafer paper together so there is an image on both sides. What's the best way to glue them? Piping gel,royal icing or another method?

piping gel

I use a little dab of egg whites on a brush to "glue" my rice paper name plates on all my cakes. I just dab it on the corners...it dries super fast and doesn't "bleed" thru on my image or writing. I use egg whites to glue on all my little flowers on fondant too.