Coo-Var Water-Based Primer Sealer Undercoat | Acrylic Primer Sealer

Name: Coo-Var Water-Based Primer Sealer Undercoat | Acrylic Primer Sealer
Brand: Coo-Var
SKU: 312/W463/1/E
Price: 40.95 GBP
Availability: InStock

by Coo-Var

£40.95 - £62.45

£40.95

£40.95 - £62.45

£40.95

Coo-Var Water-Based Primer Sealer Undercoat evens out porous plaster, wood and masonry so your finish coat glides on evenly and covers in fewer litres. By stopping paint sink in and blocking light stains, it slashes material spend, speeds turnaround and keeps customers smiling. Backed by over 100 years of British paint innovation, it’s arguably the best acrylic primer sealer money can buy. Its fast dry, low VOC formula lets you prime whole rooms before lunch while solvent rivals are still off gassing.

Key Benefits

Seal Porous Surfaces – Locks down fresh plaster and bare timber to prevent paint soak in, cutting top coat consumption and saving cash.
Prime New Plaster – Goes straight onto plaster, accelerating project schedules and getting spaces back in use sooner.
Cost Effective Coverage – High 13 m²/L spread rates mean fewer tins on large jobs, protecting your profit margin.
Multi Surface Solution – Clings to wood, masonry, PVC and more, so one primer handles the entire interior or exterior scheme, saving you cost and miniomising waste.
Low Odour, Low VOC – Water clean up and low VOC keep indoor air fresh and crews comfortable all day, paint where others can't.

DIY friendly, Roll it on now, paint over this afternoon, add to basket today for next day UK delivery, buy today, paint tomorrow and feel the time-and-cost savings immediately.

Quantity

* Please note that due to variations in monitor settings, exact colours may differ from choices above, these are for illustration purposes only.

Delivery information

Buy Now and Get Free UK Mainland Shipping on Orders Over £75.

Get It Tomorrow* – Order Before 12pm Midday for Next Working Day Delivery.

Features & Specifications

Finish / Texture: Matt
Base: Water-based acrylic
Available Colours: White
Pack Sizes: 0.5 L, 1 L, 2.5 L, 5 L
Coverage: 13 m²/L @ 35 µm DFT
Drying Times @ 20 °C: Touch dry 30 min; hard dry 2 h; full cure 5–7 days
Re-coat Interval: 6 h
Minimum Application Temp.: 7 °C
VOC Content: ≤ 30 g/L
Flash Point: Non-flammable
Application Method: Brush or roller; thin up to 10 % with clean water; clean tools with water
Surface Suitability: New or painted plaster, wood, masonry, PVC, interior & exterior
Volume Solids: 32 %
DFT/WFT: 35–40 µm DFT; 75 µm WFT

Need detailed specs or prep guidance? Chat with our experts now!

Ideal Applications

Coo-Var Water-Based Primer Sealer Undercoat | Multi-Surface Primer is the ideal choice for creating a reliable, even base across a wide range of projects:

Property Maintenance
A go-to solution for landlords and facility managers looking to prime plaster, wood, or brick surfaces quickly and effectively, reducing downtime between coats.
Hospitality & Retail
Perfect for refreshing walls and woodwork in hotels, restaurants, and shops, where low odour and swift drying times minimise disruption to customers and staff.
DIY & Home Improvement
Excellent for homeowners tackling indoor redecorating projects—easy water clean-up keeps mess to a minimum, and the fast-drying formula helps complete jobs sooner.
Education & Public Buildings
Ideal for classrooms, libraries, or offices needing a smooth undercoat that dries quickly, allowing for efficient turnarounds and less inconvenience to occupants.
Leisure & Tourism
Suitable for visitor centres, holiday let interiors, or activity spaces, providing a solid base that helps subsequent paint finishes stay vibrant and durable over time.

If you need expert advice or detailed prep guidance, contact our experts now via the live chat for tailored support!

Application & Maintenance

Surface Prep: Clean surfaces, removing dust or loose material; repair cracks or holes as needed.
Application: Stir well. Apply evenly with a brush—avoid overloading or pooling.
Drying/Curing: Wait ~6 hours before applying your chosen topcoat; follow datasheet for complete details.
Maintenance: Store any leftover primer in a cool, dry place; reseal tightly.
Pro Tip: For best results on previously painted or glossy surfaces, lightly sand before priming.

Need a step-by-step guide? Our experts are standing by—chat live now!

Customer Reviews

“A game-changer for our indoor projects. Fast drying, low odour—our team loves it!” – Sarah L.
“Went on plaster walls smoothly and topcoat adhered perfectly. Highly recommended.” – Dave R.

Have you used Coo-Var Water-Based Primer Sealer Undercoat? Leave your review or chat with us for more tips!

Ready to complete your kit? Chat with us for recommended extras!

FAQ's

1. What is Coo-Var Water-Based Primer Sealer Undercoat used for?

This primer is designed to create a smooth, even base on surfaces such as plaster, wood, and brick. It promotes excellent adhesion for topcoats, ensuring a flawless, durable finish.

2. How long does it take to dry?

The primer typically dries within 6 hours, making it convenient to apply your topcoat on the same day. Drying times may vary slightly depending on temperature and humidity.

3. Is it really low odour?

Yes, the water-based formulation emits minimal odour, which is especially helpful when working indoors or in poorly ventilated spaces.

4. Can I use it on previously painted surfaces?

Absolutely. As long as the existing paint is stable and clean, Coo-Var Water-Based Primer Sealer Undercoat can help improve adhesion and even out the surface before repainting.

5. How do I apply this primer?

Simply apply it with a brush to a clean, dry surface. Ensure any flaking paint or debris is removed beforehand. Once dry, you can proceed with your chosen topcoat.

6. Is it easy to clean up?

Yes, being water-based, you can clean brushes and tools with warm water—no need for harsh chemicals or solvents.

7. What coverage can I expect?

Coverage is approximately 13 m² per litre, depending on the substrate’s porosity and condition. Applying an even coat helps achieve the best result and maximises adhesion.

Need more advice on preparing your surface or choosing the right topcoat?

For personalised guidance or additional information, contact our experts now via live chat—we’re here to help you achieve a professional finish!

Delivery Information

Fast, Reliable & Flexible Delivery

Every order leaves our warehouse on a fully-tracked DX or FedEx service, so you can spend less time waiting and more time painting.

Delivery Options

FREE Standard Delivery (orders £75+) – arrives in 2–3 working days
Standard Delivery £7.95 – arrives in 2–3 working days
Express Delivery £13.95 – next working day when you order before 12 am (Mon–Thur)
Got a £75+ basket? Select “Express Upgrade” at checkout and only pay the difference.

Next-Day Despatch Promise

Order before 12 am (Mon–Thurs) with express delivery → ships today & receive tomorrow.
Order without express delivery → ships the next working day and receive the next working day after.
Order Thursday without express delivery → ships Friday for Monday delivery.

We do not deliver on weekends & bank-holidays

What to Expect

Upon purchasing, please provide a contact telephone number that the courier's can contact you on if they experience any issues.
All orders usually require a signature upon delivery.
If you are unlikely to be in during the day, consider having your order delivered to your place of work, or another business address where somebody will be able to accept and sign.

Outside UK Mainland?

Delivery prices shown cover UK Mainland addresses. If you’re ordering for the Highlands, Islands, Northern Ireland, or anywhere outside the mainland, just reach out—chat with us live, call 01482 222 421, or email info@specialistpaintsonline.co.uk—and we’ll give you a quick personalised quote.

Bottom line: order today, get it fast, track every mile, paint tomorrow.

Data Sheets

Safety data sheet
Technical data sheet