Zinsser Cover Stain 5 Litre is a professional-grade, solvent-based primer, sealer and stain-blocking undercoat designed to prepare and stabilise a wide range of interior and exterior surfaces before decorating. It offers exceptional adhesion, stain blocking and coverage, making it a trusted choice for demanding preparation jobs where a reliable foundation is essential.
Key Features
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Pack Size: 5 Litre
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Type: Solvent-based primer, sealer & stain blocker
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Colour/Base: White (tintable to pastel/mid-tone colours)
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Application: Brush, roller, pad or spray
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Coverage: Up to ~9.8 m² per litre (actual coverage depends on surface porosity and application method)
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Drying Time: Touch dry ~30–35 minutes; recoat in ~2 hours
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Curing Time: Full cure ~4–7 days
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Clean-up: Use appropriate paint thinner or white spirit
Performance & Benefits
Outstanding Stain Blocking
Zinsser Cover Stain delivers powerful stain-sealing performance, effectively blocking water marks, smoke, nicotine, tannin bleed and other stubborn blemishes to prevent them re-appearing through topcoats.
Superior Adhesion & Flexibility
The solvent-based formula penetrates and bonds well to many substrates — including difficult or glossy surfaces — without sanding in most cases, saving preparation time.
Interior & Exterior Use
It’s suitable for both interior and exterior applications, making it a highly adaptable primer for renovation, repair or new build decorating.
Excellent Base for Topcoats
Cover Stain creates a smooth, sealed base that enhances topcoat adhesion and finish quality, compatible with both solvent-based and water-based topcoat paints.
Fast Working:
With quick drying and recoating times, jobs can move swiftly from preparation to finishing stages.
Recommended Applications
Ideal for use as a primer/sealer on:
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New or previously painted plaster, plasterboard or drywall
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Interior ceilings and walls with stains or discolouration
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Wood trim, doors, skirting and external timber cladding
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Masonry, brick and concrete substrates
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Metal surfaces including iron, steel and aluminium
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PVC, uPVC and other non-porous or glossy supports
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Surfaces affected by water, smoke or tannin stains
Surface Preparation & Application
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Prepare Surface: Ensure surfaces are clean, dry and free from dust, grease, wax and loose coatings.
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Stir Thoroughly: Mix the primer well before and during application.
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Apply Evenly: Use brush, roller, pad or spray to achieve consistent coverage.
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Drying: Allow ~30–35 min to touch dry.
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Recoat: Ready for topcoat after ~2 hours (depending on environmental conditions).
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Cleanup: Clean tools with paint thinner or white spirit.
Why Choose Zinsser Cover Stain 5 Litre?
Zinsser Cover Stain 5 Litre combines stain-blocking power, strong adhesion, and versatile surface compatibility to deliver a reliable foundation for your decorating projects. Whether you’re sealing discoloured walls, priming new timber or preparing exterior substrates, it provides a durable, high-coverage base that enhances topcoat performance and finish quality
