This is used for clients who have a problem with lifting as an extra insurance of adhesion to acrylic or hard gel. Dehydrates. You wouldn’t use this primer alone. It would be applied prior to primer 2.
BB tip: Primer acid has a high freeze temperature so please note that if left overnight in working environment without heating in winter you may need to be careful unscrewing the bottle lid. Put product in a warmer area for a little while to avoid frozen liquid pulling the bristles from the lid applicator.