Mapei Primer G Jerrycan is a high-quality, water-based synthetic resin primer designed to improve the adhesion of smoothing compounds, tile adhesives, and renders to absorbent surfaces. Its special formulation seals porous substrates, regulates absorption, and prevents rapid water loss from the applied products. Ideal for use on surfaces such as cement screeds, gypsum-based plasters, and plasterboard, Primer G reduces dusting and enhances bonding strength. Suitable for both interior and exterior applications, it is easy to apply by brush or roller, dries quickly, and ensures a longer-lasting, professional finish.