Primer Plus is a premium concentrated multi-purpose primer designed to increase bond strength and maximize the performance of self-leveling underlayments and crack isolation peel and stick membranes on multiple interior substrates such as concrete, gypsum, wood, and more. Formulated with nanoparticles, it penetrates deep into substrates to prevent the absorption of moisture from SLU applications. This high-performing concentrate delivers superior adhesion to ensure a long-lasting application. Easy-to-use, simply broom, roll, or spray Primer Plus and experience great coverage. For use with all NXT® and SUPERCAP® self-leveling underlayments, and FRACTURE BAN®.