Primer is a form of acid used on natural nails before applying the gel/acrylic for better adhesion of matrial. Used with caution, thinly applied and air dried before acrylic or gel is applied.
Recommended on strong natural nails, do not use primer on brittle nails when the primer can degrade the quality of further thinner nails.
Superbond will then be a better alternative.

Volume 10ml