Mapei Primer L Advanced-Technology Acrylic Latex Primer for Concrete Primer L is a concentrated, solvent-free acrylic primer used before installing self-leveling underlayment materials. Improves the bond between a properly prepared and profiled concrete substrate and a self-leveling underlayment — one coat, easy application, quick drying. Also works as a primer for poured gypsum-based underlayments and screeds/mortar beds, and can be used between layers of Mapei self-leveling underlayments. Tinted green for easy coverage identification, so you can see exactly where you've primed and where you haven't. Low odor and low VOC. Concentrated formula, so a little covers a lot of ground. Click here for Technical Data Sheet Spec Detail Type Concentrated, solvent-free acrylic latex primer Use Priming concrete before self-leveling underlayment installation Also used for Gypsum-based underlayments, screeds/mortar beds, between SLU layers Color Tinted green (for coverage visibility) VOC compliance SCAQMD Rule #1113 Emissions certification CDPH Standard Method v1.2-2017; SCS Global Services Indoor Advantage Gold Cleanup Mineral spirits (once dried) Package sizes 1 gallon, 5 gallon Why is Primer L tinted green? So you can easily see where it's been applied and confirm full, even coverage before moving to the next step. Can I use this under gypsum-based underlayment? Yes — it's also suitable as a primer for poured gypsum-based underlayments and screeds/mortar beds. Do I need this between two coats of self-leveling underlayment? Yes — Primer L can be used between layers of Mapei self-leveling underlayments. Is it low-VOC? Yes — low odor and low VOC, compliant with SCAQMD Rule #1113 and certified under CDPH Standard Method v1.2-2017. Sku: 36053000