Mapei - Primer L - 1 gal jug

Advanced-Technology, Acrylic Latex Primer for Concrete. Primer L™ is a concentrated, solvent-free acrylic primer used before the installation of underlayment materials. It is green for easy identification. Primer L improves the bond between a properly prepared and profiled concrete substrate, and a self-leveling underlayment. Primer L can also be used as a primer for gypsum-based underlayments and patches.