Mapei Primer L

Primer L is a concentrated, solvent-free acrylic primer designed to improve the bond between properly prepared concrete substrates and self-leveling underlayments. Its green tint makes coverage easy to verify, while its low odor and low VOCs support safer indoor use. Primer L is ideal for priming concrete, gypsum underlayments and mortar beds, and can also be used between layers of MAPEI self-levelers. The formula dries quickly—typically within 3 hours—and helps ensure strong adhesion and a smooth, stable surface before applying underlayments or patches. Suitable for interior applications where clean, dependable surface preparation is required, Primer L is easy to mix, easy to apply and effective on porous or profiled substrates that need reliable bond enhancement.