Tuff Enuff Nails Linkage Protein Bonder Linkage is a protein bonder designed with an incredible ability to link to the keratin (protein & amino acids) found in the natural nail plate. Linkage creates a bonding to the natural nail by means of “Uni-layer Molecular Coupling”, which in simple terms means a molecule that joins two things. The Linkage molecules bond to the organic Keratin molecules in the natural nail plate, putting a protective layer over the entire natural nail allowing the nails to grow out naturally and healthy. The other side of the molecule is bonding to the component, gel/acrylic. With Linkage lifting is virtually eliminated.It contains absolutely no acid or damaging chemicals, and actually improves the health of the nail. You will be amazed at the perfect bond, and how it virtually eliminates lifting when the nails are properly prepped Make sure to always store Linkage properly as it will harden if left open! Spare bottles should be stored in the fridge. The lid must be kept tightly on when not in use. Also, try not to get it on the threads of the bottle or the cap will be extremely hard to remove.