Sigma Bond - is an acrylic based adhesive designed specifically for lace front hair systems. Sigma Bond can also bond lace and poly based hair systems to the skin with superior strength and comfort. It is strong, safe, easy to use and economical. This adhesive is great for daily wear, touch-ups, and up to two weeks of adhesion. Longer adhesion times can be achieved when used with Top Guard Skin Barrier. Sigma Bond can be easily removed with Super Solv or Super Solv Plus adhesive removers.