We mainly use glue such as spray glue, hot melt adhesive, white glue, glass glue, etc. (according to different surface) to stick acoustic panels onto the wall. For flat cement wall, you may install the boards directly with white glue and gun nail, which is glue-saving and time-saving. Pasting sing-side glue on the based surface is strongly suggested as well as layering process. http://www.arflyfelt.com