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Clear Stain Blocking Primer

It’s easy to keep your paint job looking great by applying a base coat of stain blocking primer first, stopping tannins from wood coming through and staining your paint coating. Also blocks resin bleed and sap stains.

Thorndown’s Clear Stain Blocking Primer is a high performing multi-surface primer primarily developed for tannin and stain blocking on timber surfaces. 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.

It works on all untreated softwood and hardwood timber surfaces, including pine, cedar, redwood, plywood, MDF and hardboard. And pressure treated timber, Accoya, and all painted surfaces of timber, masonry and plaster.

This Clear Stain Blocking Primer is low in VOC and suitable for any application inside or outside.

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    It’s easy to keep your paint job looking great by applying a base coat of stain blocking primer first, stopping tannins from wood coming through and staining your paint coating.

    Thorndown’s Clear Stain Blocking Primer is a high performing multi-surface primer primarily developed for tannin and stain blocking on timber surfaces.

    It works on all untreated softwood and hardwood timber surfaces, including pine, cedar, redwood, plywood, MDF and hardboard. And pressure treated timber, Accoya, and all painted surfaces of timber, masonry and plaster.

    • Works on all untreated softwood and hardwood timber surfaces, including pine, cedar, redwood, plywood, MDF and hardboard. On oily hardwoods such as Iroko drying time will be greater
    • Works on pressure-treated timber and Accoya
    • Works on all painted surfaces of timber, masonry and plaster
    • Quick drying – Dry in 1 hour in fine weather cnly 1 coat is needed but you can apply a second on particularly resinous or troublesome wood, like very knotty woods or ones with high tannin bleed or leeching
    • Water-based primer, sealer and stain killer
    • Suitable for use on interior and exterior surfaces
    • Excellent adhesion to all timber and painted surfaces
    • Blocks stubborn and persistent stains including water stains, marker pens and more
    • Seals porous surfaces with excellent blocking of bleeding knots and sap streaks
    • Flash rust inhibitor prevents rust forming while drying
    • Fungicide film preservation stops the paint film degrading with mould
    • Low VOC
    • Coverage up to 12m2 per litre on smooth surfaces, 6m2 on rough surfaces
    • Moisture regulating microporous primer
    • Water wash up
    • Apply with brush (high quality synthetic recommended), roller or sprayer
    • Available in Clear, White, Grey and Black

    You can view and download a pdf of Stain Blocking Primer USPs here, download the full Stain Blocking Primer USP and Application Advice sheet, or visit Advice – Stain Blocking Primer for full product information and application advice.

    Weight N/A
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    Tin size

    750 ml, 2.5 litre, 20 litre

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    Delivery & Returns

    We aim to deliver next working day and always within 3 working days from receipt of order, however orders received before midday are usually sent on the same day and delivered direct to your door the next working day! Sample tins are usually sent out by Royal Mail 1st Class Post and we use a trusted professional courier service for all other deliveries.

    Notes can be left with deliveries for directions to leave packages safely if you are not in and if you have any particularly urgent or specific instructions please contact us - we're confident we can sort it out.

    Please follow this link to visit the Delivery & Returns page for full information and latest details on final order and delivery dates around bank holidays and other events.