App Primer is a high-performance, water-based bonding agent specifically formulated to enhance adhesion between substrates and finishing compounds such as gypsum-based plasters, cement renders, and skim coats. Engineered with advanced acrylic polymers, it delivers superior grip on both porous and non-porous surfaces, reducing surface absorption and improving workability. App Primer is fast-drying, low-odor, and ideal for interior or exterior use on concrete, masonry, drywall, and previously painted surfaces. Coverage: approx. 8–10m2 per liter. Available in 5L and 20L packs.