Coo-Var Patent Knotting | Shellac Based Knot Sealer

• Finish / Texture:Base: Shellac solution in alcohol
• Available Colours: Translucent Brown
• Pack Sizes: 0.25 L, 0.5 L, 1 L, 2.5 L
• Coverage: Up to 13 m²/L @ 75 µm WFT
• Drying Times @ 20 °C: Touch dry 10 min; hard dry 3 h; full hardness 2–3 days
• Re-coat Interval: Minimum 6 h @ 20 °C
• Minimum Application Temp.: 5 °C
• VOC Content: 581 g/L
• Flash Point: 12 °C (closed cup)
• Application Method: Brush (clean with Thinners 6)
• Surface Suitability: Knotted or resinous softwood & hardwood, interior & exterior, prior to primer/paint
• Volume Solids: 27 %
• Wet Film Thickness (WFT): 75 µm
• Dry Film Thickness (DFT): 20 µm

Need specifics on drying times or coverage? Chat with our experts now and seal your knot!

The Coo-Var Patent Knotting | Shellac Based Knot Sealer is an essential solution for ensuring smooth, flawless finishes on knotted or resinous timber across a variety of applications:

• Property Maintenance: Ideal for landlords and facility managers preparing wood surfaces in rental properties, such as doors, skirting boards, and outdoor trims, to prevent staining or discolouration.
• DIY & Home Improvement: Perfect for homeowners tackling wood painting or varnishing projects, from furniture restoration to window frames and outdoor decking.
• Hospitality & Retail: A reliable solution for sealing wooden fixtures, shelving, or decorative pieces in bars, restaurants, and boutique spaces to ensure a polished, professional appearance.
• Leisure & Tourism: Great for maintaining outdoor wooden features like benches, fencing, or decorative trim in parks, resorts, and activity centres, safeguarding them against the elements.
• Creative Projects: A must-have for crafters and woodworkers ensuring knot-free finishes on handmade furniture, artistic wood projects, or bespoke pieces.

If you need expert advice on sealing knots or preparing wood surfaces, contact our experts now via the live chat for tailored guidance!

• Surface Prep: Ensure wood is clean, dry, and free of loose fibres or old flaking finishes.
• Application: Stir product gently if needed. Brush a thin layer onto knots/resin-rich areas.
• Drying/Curing: Allow recommended drying time (check datasheet) before applying paint or varnish.
• Maintenance: Once sealed, proceed with primer or direct painting as per your project’s needs.
• Pro Tip: For highly resinous knots, apply multiple thin coats to fully lock out stains.

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

• “Incredible difference! No more yellow spots on my painted pine boards. A must-have.” – Sarah W.
• “Used it on exterior knotty fence panels—paint still looks pristine after months.” – James M.

Have you used Coo-Var Patent Knotting? Leave your review or chat with us for more tips!

Free Delivery on Orders Over £75: Pick up everything you need in one go to qualify

• Coo-Var Primers & Undercoats: Ideal for a fully prepped paint job
• Specialist Wood Care: Protect and enhance your wood’s natural grain after knotting
• Application Tools: Brushes, paint trays, and extension poles

Want everything in one basket? Chat with us for recommended extras!

1. What is Coo-Var Patent Knotting used for?

Coo-Var Patent Knotting is a shellac-based solution designed to seal knots and resinous areas in wood. It prevents discolouration and staining that can bleed through paint or varnish.

2. Can I use this product on both interior and exterior wood?

Yes, this knot sealer is suitable for both interior and exterior projects. It forms a weather-resistant barrier, keeping knots sealed against moisture and the elements.

3. How do I apply the knotting solution?

Simply brush a thin, even coat onto the knots and surrounding areas. Ensure the wood surface is clean and dry before application. For heavily resinous knots, multiple thin coats may be required.

4. Does it affect the appearance of the wood?

The shellac-based solution dries to a translucent finish. It blends with most wood surfaces and is easily covered by paint or varnish without affecting the final look.

5. Can I paint or varnish over Coo-Var Patent Knotting?

Absolutely. Once the knotting solution is dry, you can apply your chosen paint, varnish, or stain, confident that knots won’t bleed through and spoil the finish.

6. Is there any special ventilation or safety requirement?

Use this product in a well-ventilated area, and follow the guidance on the product datasheet for handling instructions. It’s shellac-based, so standard precautions for solvent-containing products apply.

7. How can I ensure the best results?

Focus on covering all knotted or resinous areas thoroughly. Allow each coat to dry before applying any additional layers or topcoats. For tailored advice on your specific wood type or project, get in touch with our experts.

Need help sealing knots or preparing wood surfaces?

For personalised recommendations or further guidance, contact our experts now via live chat—we’re here to help you achieve a flawless, knot-free finish!

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.

Technical Data Sheet

Safety Data Sheet