CHOOSING WALLPAPER GLUE IS VERY IMPORTANT. THIS WALLPAPER GLUE IS 100% FREE OF FORMALDEHYDE, AND TRIPHENYL (TOLUENE XYLENE). THIS PRODUCT IS ENVIRONMENTALLY FRIENDLY AND SAFE FOR ALL OF YOUR PROJECTS. THE PACKAGE IS IN POWDER FORM. JUST MIX WITH WATER. EACH PACKAGE CONTAINS ENOUGH GLUE TO APPLY 18 - 20 METERS OF WALLPAPER.