Bill hit it on the head. I have used bottle after bottle of Gorilla Glue building props for my shows, and unless the surfaces are clean, then wetted, the glue will not work as it should. Two simple steps, but if one gets in a hurry and tries to skip them, guaranteed glue faliure. However, follow the directions, and it is one of the strongest glues on the planet. About the only thing stronger and as adapatable to a myriad of surfaces is Cool Chem's Cyanopoxy (another of my favorites). However, it does not "foam up" like Gorilla Glue.
ROBBiE the RiNGMASTER'S
CiRCUS of MAGiC!