Product description The Bo. Acid Free Primer is the first step to ensure the bond between your natural nail and the BO. Acrylic System. It is a non-corrosive formula that prevents damage and thinning of the natural nail plate and prevents lifting. Features & Benefits Superior adhesion Prevents air between the natural nail and the acrylic nail Usage BO. Acid Free Primer can be applied to the natural nail after it has been thoroughly cleaned with the BO. Natural Nail Sanitizer.