Elmer's washable clear school glue
I saw this in the school supplies and wondered if it would work for bindings. I did a 3 inch sample square with mitered corners and lots of messy liquid glue. I used the hot iron to dry each little side and corner one at a time. I sewed the binding edge down by machine and it didn't bother my machine. I washed the little square to see if the glue would come out and it did. I will be using this again on a larger quilt.
I thought with the clear glue, I could use it for my wallhanging bindings too and they would not need to be wash if I didn't want to. The glue left in the binding is a little stiffer and I thought that would be excellent for wallhangings.