Hi, I was wondering if polyurethane glue(gorilla glue, elmer's probond, etc.) would be OK for attaching air plants to cork. I've tried silicone and had what I would call poor results. I was thinking, since the polyurethane works with moisture, it would hold better. but would it be safe? Also, I've heard of a product called tilly tacker which is sold for this purpose, but I haven't seen it for sale anywhere, any hot tips out there?