I use the regular washable school glue stick and have not had any problems and some of my hexies have been sitting for over a month, when the occasional one starts to come up I just re glue it. Some of them hold tighter than others but love the quickness of doing this way. Glue stick is a regular staple in many of my pick up and go projects. I have been using it for years for various reasons from positioning difficult fabrics in place when crazy quilting with odd pieces to basting seams especially where they join another seam.