CERESIT® CT17 Primer is a deep-penetrating, solvent-free product designed to prepare absorbent and dusty substrates. It strengthens the surface before applying adhesives, plasters, paints, or insulation materials. Whether you’re working on concrete, screed, or old plaster, this primer ensures long-term durability and adhesion.

This universal primer is ideal for both interior and exterior applications. It deeply penetrates porous materials, reduces absorbency, and improves the grip of follow-on layers. One of the major advantages is its quick-drying formula that allows for “wet-on-wet” applications after just 15 minutes. For builders and contractors, this means faster job turnaround and reduced delays on-site.

CT17 Primer is widely used in ETICS (External Thermal Insulation Composite Systems), especially before applying EPS or XPS insulation boards. It also helps reduce the consumption of adhesive mortars, levelling compounds, and finishing renders.

The 5 L container provides coverage of approximately 50–60 m², depending on the porosity of the surface. This makes it a cost-effective and practical choice for both professionals and DIY users.

Key Properties

• Stabilises dusty and absorbent substrates
• Quick-drying with “wet-on-wet” capability
• Reduces material consumption
• Improves adhesion for renders and adhesives
• Suitable for interior and exterior use
• Compatible with ETICS insulation systems

For best performance, apply this primer before using CERESIT CT85 FLEX Adhesive or CERESIT ZU Base Coat as part of your insulation setup.

For more detailed instructions and data sheets, visit the official Ceresit UK website.

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CERESIT® CT16 Quartz Primer is a water-based base coat designed to improve surface grip before applying decorative renders or paints. It is essential in both traditional plastering and ETICS (External Thermal Insulation Composite Systems).

This primer contains quartz aggregates that roughen the surface and boost scratch resistance. This helps prevent slippage of finishing coats and improves long-term durability. It’s suitable for concrete, gypsum plaster, chipboards, plasterboard, masonry, and previously painted walls.

The product reduces substrate absorbency and slows down drying time, making application of acrylic, mineral, silicone, or silicate plasters easier and more consistent. It also unifies the colour and texture of the surface, preventing blotching or uneven shades in coloured renders.

This quartz primer is ideal for professionals working on external façades or detailed interior finishes. It is quick-drying, easy to apply by hand or spray, and essential for achieving clean, lasting results.

Key Properties

• Improves adhesion and reduces surface absorbency
• Roughens the surface thanks to quartz fillers
• Minimises slippage and enhances mechanical grip
• Unifies surface colour before final plastering
• Quick-drying and suitable for spray application
• Compatible with ETICS and indoor surfaces

Apply this quartz primer before using CERESIT CT74 Silicone Render or CERESIT CT60 Acrylic Plaster. For complete insulation systems, combine it with CERESIT CT85 FLEX Adhesive for professional results.

Visit the official Ceresit international website to learn more.

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