I find that the metal tips work the best if the glue is thinned a bit with water. Otherwise it takes quite a bit of pressure to get the glue through the tip and it still does the job if it's thinned. Does a lovely binding without pins but do try to keep the glue out of the center of the fold so you can still sew it by hand without contending with the dry glue....that is if you still sew your binding by hand.