Keratin bond glue is a type of keratin-based adhesive used in both the creation (pre-bonding) and installation (fusion method) of pre-bonded hair extensions, such as U-tip, I-tip, V-tip, and Flat-tip extensions. It’s a popular, semi-permanent method for achieving long-lasting, natural-looking hair extensions. Keratin bond glue is a heat-activated, protein-based adhesive used to create and install pre-bonded hair extensions like U-tip, I-tip, and Flat-tip. It offers a long-lasting, natural-looking, and flexible bond when applied with the fusion method, making it a preferred option in professional hair extension systems.