MAPEI Primer T is an essential preparatory step before applying self-leveling underlayments. By sealing porous substrates such as concrete, it prevents the substrate from rapidly absorbing moisture from the underlayment, which allows the product to flow properly and prevents the formation of air bubbles and pinholes that can weaken the finished surface. This low-VOC, water-based formula is vital for creating a reliable interface that ensures the underlayment remains bonded to the floor. To ensure peak performance, the substrate must be clean and free of all contaminants like oil, grease, or paint. Application can be performed via brush, roller, or spray, but you must strictly follow the dilution instructions provided in the technical data sheet, as these vary based on the porosity of the substrate. Protecting the primer from freezing is mandatory, as cold damage will ruin the chemical integrity of the bond. Proper priming is the difference between a floor that lasts and one that risks delamination.
Key considerations
- MAPEI Primer T
- what is primer T
- underlayment primer
- MAPEI
- Primer
- Floor Prep