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Wall Primers and Undercoats
Keim Design Base Masonry Paint Additive
Sol-silicate based, pigment-free additive for KEIM Design-Lasur. Used as thinner for KEIM Design-Lasur to achieve translucent colour designs. For interior and exterior application. Siliceous Weathering-proof Unpigmented Density: approx. 1.1-1.2 g/cm3 pH-value: approx. 11 Cradle to Cradle Certified Silver Consumption Rate Samples...
Keim Design Fixativ
A sol-silicate based primer and thinner for KEIM Design-Lasur. Used as pre-treatment for strongly absorbing substrates and as dilution for most transparent finishes with KEIM Design-Lasur. Absolutely lightfast Weatherproof Resistant to environmental influences Mineral matt Cradle to Cradle Certified Silver Consumption Rate Samples...
Tikkurila ProSeal
A waterborne primer with good penetrating properties. To be used for absorbing surfaces before applying BioRid, BioRid Spray or Tikkurila+AsbestGuard. Suitable for priming of interior walls and ceilings, on absorbing substrates. Can also be used for binding loose or badly bonded asbestos material and binding asbestos dust, or after...
Keim GW Primer (Ecosil Grund)
A silicate-based primer coat, used as an internal base coat to equalise different absorbencies on repaired or filled surfaces. Equalises surface. Levels surfaces. Good adhesion. Cradle to Cradle Certified Silver. Note: The name of this product will change in early 2023 - also known as Keim Ecosil Grund Consumption Rate Samples
Zinsser Wallpaper Cover-Up
All-in-one primer, sealer, and stain blocker in an off-white matt finish. Designed to obliterate wallpaper print and prevent blistering of wallpaper. Effective at blocking water-soluble stains, providing a smooth finish for any coloured emulsion. Fast drying with touch dry time of 2-4 hours and recoat time of 4 hours. Suitable for use on...
Zinsser Drywall Pro 2 in 1
Primer sealer in a white finish. Ideal for sealing and priming new and damaged drywall, plaster, and porous surfaces prior to painting. Works with all paints and wallcoverings. Prevents drywall damage during redecoration. Fast drying with a recoat time of 3 hours. Water-based with low VOC content.
Zinsser Gardz
A clear, water-based, acrylic resin sealer. Can be used on damaged drywall, new drywall, plaster, calcimine, residual wallpaper adhesive, textured walls, and popcorn ceilings. Penetrates deeply into porous surfaces to create a hard, moisture-proof film. Prevents drywall blistering and bubbling by sealing and binding surfaces. Strengthens...
Zinsser Peel Stop
A clear flexible binding primer designed to seal and prevent peeling. Suitable for use on both interior and exterior paintable surfaces including wood, metal, masonry, and more. Glues down edges of old paint and bridges cracks to provide a sound surface for topcoats. Binds chalky surfaces, preventing future peeling and ensuring a durable...
Hanford & Green All Purpose Primer
Available in white. Multi-surface acrylic primer. For concrete, brickwork, asbestos, iron, aluminium, lead, zinc, copper, timber, slate, fibreglass, plaster, and cement fibre board. Low odour and low VOCs. Quick drying. Strong adhesion.
Coo-Var Alkali Resisting Primer Sealer
White alkali-resisting primer. For walls, plaster, brick, and screed. Resistant to solvents and salts.
Coo-Var Acrylic Primer Sealer Undercoat
White water-based primer and sealer with a matt finish. For priming plaster or wood surfaces. Interior or exterior use. Low-odour, non-flammable.
Mathys Pegafix
Mathys Pegafix is a colourless impregnating primer for porous, mineral substrates such as concrete, breeze block, bricks, etc. before painting them with waterborne paints. High fixing capacity Superior penetration characteristics Water based
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Interior Wall Primers and Undercoats - Prepare Walls for a Flawless Finish
Primers and undercoats are essential for creating a sound foundation before applying emulsions or decorative paint on interior walls. These specialist products prepare the surface by evening out porosity, increasing adhesion, and building a solid, uniform base for topcoats. In settings where time, budget, or appearance matters, this preparation step is vital. Even small imperfections like residual dust, patches of bare plaster, or varied sheen from touch-ups can cause the final finish to underperform.
This range includes Zinsser solutions designed to meet a variety of surface conditions. Water-based primers are ideal for quick turnaround times and low-odour environments such as residential and care settings. Solvent-based products provide robust stain-blocking, often chosen in high-traffic commercial interiors or housing with significant staining from damp, smoke, or nicotine. The selection also includes specialist products tailored to challenging materials such as glossy oil-based paints, powdery plasters, or absorbent surfaces like bare concrete and fibreboard.
Undercoats in this category help improve opacity, especially when making a dramatic colour change. By neutralising the base colour, they reduce the risk of show-through and help the final topcoat reach its true depth and shade faster. This improves job efficiency and cuts down on material costs, especially when using premium decorative finishes in bold colours. Selecting the right primer and undercoat combination improves the long-term performance of the entire system. Customers unsure of which solution to choose are encouraged to contact the technical support team for guidance on compatibility with specific wall conditions, surface types, and finishing paints.
Wall Primers and Undercoats FAQs
Do I need both a primer and an undercoat?
Not always. Some products are formulated as all-in-one systems, but separate primer and undercoat may be needed for problematic or high-performance areas.
Can primers be used on painted wallpaper or lining paper?
Only certain primers are suitable. Always check the product’s technical data or ask for guidance - some may cause bubbling or poor adhesion.
Is it necessary to use a primer on newly skimmed plaster?
Yes. Fresh plaster is highly absorbent. A mist coat or plaster primer helps prevent patchiness and uneven drying of the topcoat.
Can I use interior wall primers on ceilings or joinery?
Not all are suitable. Ceilings may need high-opacity primers, and joinery often requires specific wood primers or adhesion-promoting products.
Are these primers safe for use in areas with children or pets?
Water-based, low-VOC formulations are ideal for nurseries, schools, or healthcare settings. Always check the safety data sheet for assurance.
What should I do if the wall has mould?
Use an anti-mould primer only after removing visible mould with a suitable fungicidal wash. Do not paint directly over active growth.
Can I apply undercoats with a roller or do I need a brush?
Both methods are usually acceptable. Rollers are ideal for speed and flat walls; brushes are better for edges and detail work.