Thorndown Clear Stain Blocking Primer - 2.5L
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wilkoThorndown Paint - Clear Stain Blocking Primer - Water-Based - 2.5L
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Thorndown Clear Stain Blocking Primer - 2.5L - Water-Based - for Timber SurfacesFree delivery in 1–3 days£44.00Visit shop →
Product Information
Full details
This guide is for DIYers and professionals working with timber surfaces who need to prevent stains and resin bleed from affecting their final paint finish. The Thorndown Clear Stain Blocking Primer offers excellent tannin and stain blocking capabilities, ensuring a smooth, consistent topcoat, especially when used with Thorndown's wood paints. While highly effective, its primary focus is on timber, meaning it may not be the optimal choice for other substrate types.
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| Brand | Thorndown Paint |
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FAQs
What types of wood can I use this primer on?
You can use it on all untreated softwood and hardwood timber surfaces, including pine, cedar, redwood, plywood, MDF, and hardboard.
Can I use this primer on painted wood?
This primer is primarily for untreated timber. If applying over existing paint, ensure the paint is sound and well-adhered. Lightly sand the existing paint to create a key for better adhesion. It is best tested on a small, inconspicuous area first.
How long does it take to dry?
In fine weather, the primer dries to the touch in approximately one hour. It can be recoated after this time.
Do I need to apply a second coat?
Typically, one coat is sufficient. However, a second coat is recommended for particularly resinous or knotty woods, or surfaces with high tannin bleed or leeching.
Can I use this primer indoors and outdoors?
Yes, the primer is low in VOCs and suitable for any application, inside or outside.
What Thorndown paints are compatible with this primer?
It is perfect for use with Thorndown's UV clear and translucent wood tone wood paint colours, and semi-opaques such as Golden Somer, Rowan Berry Red and Sundowner Orange.
How do I clean my brushes after using this primer?
Clean your brushes and equipment with water immediately after use.
Troubleshooting
Stains are still visible after priming.
Ensure the surface was properly prepared and free of contaminants. For highly porous or resinous woods, a second coat of primer may be necessary. Allow adequate drying time between coats.
Primer is not adhering to the surface.
Check that the timber surface is dry, clean, and free from dust, grease, or wax. If the wood is very smooth or glossy, it may need light sanding to create a mechanical key for adhesion.
Primer is drying too quickly and leaving brush marks.
Work in smaller sections, maintain a wet edge, and use a good quality brush or roller. Consider applying in cooler temperatures or more humid conditions if possible.
The primer appears milky or cloudy after drying.
This can sometimes occur in high humidity. Ensure good ventilation. It may be an indication that a second coat is required for full opacity and stain blocking. Test the topcoat in an inconspicuous area.
Pros and Cons
Pros
- Excellent at blocking stubborn wood stains and resin.
- Quick drying time speeds up project timelines.
- Low VOC formula is environmentally friendlier and safer to use.
- Works on a wide variety of common timber types.
- Enhances the finish of compatible Thorndown paints.
Cons
- Primarily designed for timber surfaces; may not adhere or perform as well on other materials.
- Requires specific Thorndown topcoats for optimal performance and aesthetic.
- Performance on heavily treated or non-porous wood may vary.
- Two coats might be necessary for extremely knotty or resinous woods, increasing material usage.
Setup, Compatibility & Care
Preparation: Ensure all timber surfaces are clean, dry, and free from dust, grease, or loose coatings. Lightly sand any smooth or previously finished surfaces to create a key for adhesion. For very knotty or resinous woods, it is advisable to wipe down the surface with a solvent to remove surface oils before priming.
Application: Stir the primer thoroughly before use. Apply a single, even coat using a brush or roller. For particularly troublesome woods (e.g., very knotty pine, high tannin woods), a second coat may be applied after the first coat has dried for one hour.
Compatibility: This primer is specifically formulated for use on untreated softwood and hardwood timber surfaces, including pine, cedar, redwood, plywood, MDF, and hardboard. It is designed to be used with Thorndown's UV clear, translucent wood tone, and semi-opaque wood paint colours. It is not recommended for use on non-timber surfaces like metal or plastic.
Drying: The primer dries to the touch in approximately one hour in fine weather. Ensure adequate ventilation during and after application. Recoat after a minimum of one hour, or longer in damp or cold conditions.
Care: Keep containers tightly closed when not in use. Store in a cool, dry place away from direct sunlight and frost. Clean tools and equipment with water immediately after use.