Could you explain a bit more what you mean by "melting"? What glue are you using, and how long after the application did it "melt"? And what kind of base are you wearing?
I run into the same problem. Oily skin causes the glue to melt, it sucks and not much you can do besides Scalp Protector and redoing your hair system more often. I try to do mine once every 6-7 days.
