Lace Adhesive Sigma Bond – Extra strong adhesive suitable for all Lace Hair Replacement Systems. Sigma bond lace wig glue is an advanced acrylic based adhesive and provides an extra strong bond for Lace and Poly based Second Skin Hair Systems. Sigma bond is fully tested for dermal irritation and does not contain any toxic aromatics. Bottle is fitted with a very handy dabber for ease of application to the scalp. This Sigma Bond Lace Adhesive is our No1 choice all Lace Hair Systems. Small: 39ml.