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Ceresit CT17 Profi Wall Primer 5 L — Deep-Penetrating Consolidation for All Absorbent Substrates Product Overview Ceresit CT17 Profi 5 L is a deep-penetrating consolidation primer that soaks into porous masonry, plaster, and screeds to strengthen the surface layer, lock down dust, and regulate moisture absorption — giving every subsequent coat a stable, uniform substrate to bond to, available in the exterior render primers range at Renders World. Based on an aqueous dispersion of synthetic resins, this solvent-free formula penetrates the pore structure of the wall, binds loose aggregate particles together, and reduces absorbency so that adhesives, basecoats, renders, paints, and floor compounds dry at a controlled, even rate across the full area. The distinctive yellow tint shows exactly where you have primed, making missed patches immediately visible on site — a feature that saves rework on large facades and multi-room interior projects. Faster project scheduling is one of the most practical advantages of CT17 Profi: on cement and cement-lime substrates, tile adhesive can be applied just 15 minutes after priming, while renders and paints require approximately 2 hours of drying time under standard conditions. The 5 L container covers between 10 and 50 m² depending on substrate porosity (consumption rate 0.1–0.5 l/m²), making it the right size for single-room renovations, partial elevations, and detail work around windows and doors. CT17 Profi works indoors and outdoors on virtually every absorbent substrate — concrete, all types of plaster, screeds with underfloor heating, gypsum board, aerated concrete blocks, and chipboard — and is specified within Ceresit facade systems as the consolidation stage before quartz primers and silicone render topcoats — so one product covers the preparation stage for virtually any wall, floor, or ceiling project you are likely to encounter. Key Benefits Uniform Drying Across Patchy Substrates: CT17 Profi evens out absorption differe