Bond X is an extra-strong version of Ultrabond Primer. It provides maximum adhesion for all products (gel polish, gel and acrylic) and can even be used under nail polish. Minimizes lifting and will increase the longevity of the nail enhancement. Air dries. Can be applied twice, and may be applied in a thicker layer and cured in the UV lamp for 20 seconds (5 sec LED-UV). Can also be used after finish filing to hide small lift lines.