Blackfriar Patent Knotting Protects and Seals Knotty Wood 2.5 kg

Manufactured by Blackfriar

Why Choose Our Products?

Seals knots and resin effectively to prevent staining.

Quick-dry formula for fast efficient workflow

Suitable for interior and exterior timber applications

Improves adhesion and finish of subsequent paints or varnishes

Easy-to-use brush-on solution for professional-quality results

Blackfriar Patent Knotting is a high-quality, shellac-based solution designed to seal knots and resinous areas in wood, providing a stable and smooth base for subsequent paint or varnish. Its translucent amber formula penetrates deep into timber, preventing sap bleed, resin migration, and discoloration from affecting the topcoat finish. Suitable for both new and stripped wood, Patent Knotting helps achieve a professional, even appearance while maintaining the natural integrity of the timber.

Unlike traditional primers, this fast-drying, solvent-based solution offers superior adhesion for undercoats and decorative finishes. It is ideal for interior and exterior wood applications where knots, resin, and sap may cause paint, varnish, or lacquer issues.

Key Features & Benefits

Pure Shellac Formula: Seals knots, sap, and resin to prevent staining of subsequent coats.
Quick Drying: Touch dry in 15–30 minutes for efficient project turnaround.
Versatile Use: Suitable for interior and exterior timber, new wood, or stripped surfaces.
Improves Finish: Provides a stable, smooth base for paints, varnishes, and topcoats.
Solvent-Based: Penetrates deep into timber to lock in problem areas effectively.
Economical Coverage: Approximately 14 m² per litre, depending on wood porosity.
Professional Results: Reduces bleeding, resin streaks, and color variations for flawless finishes.
Easy Application: Brush-on formula for controlled and even application.

Ideal Uses

Interior wood panels, doors, and skirting boards
Exterior timber, including cladding and joinery
Knotty or resin-rich timber prone to bleeding
New wood or stripped surfaces before painting or varnishing
Furniture preparation before applying decorative topcoats

Sizes & Coverage

Pack Size: 2.5 L
Coverage: ~14 m² per litre, depending on wood type and porosity

Surface Preparation

Clean Timber: Remove dust, dirt, grease, and loose fibres from the wood surface.
Stripped or Sanded Wood: Remove old finishes, flaking paint, or varnish before application.
Dry Surface: The wood should be dry but can have slight moisture; avoid overly wet surfaces.

Mixing

Stir Thoroughly: Shake or stir the product well before and during use to ensure uniform consistency.
Ready to Use: No thinning required; apply directly from the tin with a brush.

First Coat

Application: Apply evenly using a brush over knots, resinous areas, or timber surfaces requiring sealing.
Coverage: Approximately 14 m² per litre; adjust according to wood porosity.
Focus on Knots: Ensure knots and resin streaks are fully covered to prevent bleed-through.

Drying & Recoat

Touch Dry: 15–30 minutes at 18 °C.
Recoat: Allow 1 hour before applying topcoats of paint or varnish.

Additional Tips

Multiple Knots: A second coat may be applied after the first has dried for heavily resinous wood.
Avoid Translucent Coatings: The amber colour may darken or alter the appearance of translucent finishes.
Interior & Exterior Use: Effective for doors, panels, furniture, cladding, and joinery in both environments.

Cleaning

Clean Tools: Wash brushes with warm, soapy water immediately after use.

Storage: Keep the tin tightly sealed in a cool, dry place away from direct sunlight.

DATA SHEETS AND PRODUCT FILES

Below are all the products and files we have on this coating. If you require any more information on this product, please email us at support@tradesuppliesuk.co.uk or call us on 07929 525648 and one of our staff members will do their best to try and provide you with the information needed.

FILES AND DATA SHEETS

No files available for this product.

COVERAGE CALCULATOR

MEASURE YOUR DIMENSIONS

Do you know the area?

Yes No

Number of coats:

Frequently Asked Questions

What is Blackfriar Patent Knotting used for?

It seals knots and resinous areas in timber, preventing them from bleeding through paint or varnish for a smooth, even finish.

Can Patent Knotting be used on new wood?

Yes, it is ideal for new, stripped, or sanded timber before applying topcoats.

Is this product suitable for exterior use?

Yes, it can be used on both interior and exterior timber.

How do I apply Patent Knotting?

Apply directly with a brush from the tin, ensuring knots and resin streaks are covered. No thinning needed.

How long does it take to dry?

Touch dry in 15–30 minutes at 18 °C, recoatable after 1 hour.

How many coats are recommended?

One coat is usually enough, but two may be used on heavily resinous timber.

Can I use Patent Knotting under translucent paints or varnishes?

Not recommended, as its amber colour may affect appearance.

What surfaces is Patent Knotting suitable for?

Timber surfaces such as doors, panels, furniture, cladding, and joinery.

How much coverage does it provide?

Approximately 14 m² per litre, depending on timber porosity.

Can it prevent resin or sap from bleeding through paint?

Yes, it seals knots and resin areas to stop sap or resin stains appearing.

How should I clean my brushes after use?

Clean immediately with warm, soapy water while wet.

How should Patent Knotting be stored?

Keep sealed in a cool, dry place away from heat and sunlight.

Can it be used over previously painted timber?

Yes, if old paint is stable, clean, and free from loose material.

Is Patent Knotting solvent-based?

Yes, it is shellac-based in methylated spirit for effective knot sealing.

Select Variant and Order

£44.99 (inc VAT)

Tax included Shipping calculated at checkout.

Our Experts Recommended

Delivery within 24 to 48 hours

Size

2.5 Litres

Product variants

*subject to stock levels at the time of your order.