Ayomi keratin Bond XL Liquid Adhesive 1.3 oz
Invisible Bonding for Poly & Lace Systems.

Caution:
Use this product properly to get the best results, get instructions on usage advice from your hair stylist. And it is best removed with a glue remover.

It may also start to come off under the following conditions:

Oily Scalps
High Humidity
Heavy Perspiration
Water Based Co-polymer.