Buy Ronseal Knot Block Primer and Undercoat 750ml - White | JDSDIY.COM – JDS DIY
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Buy Ronseal Knot Block Primer and Undercoat 750ml - White | JDSDIY.COM
Ronseal Knot Block Primer and Undercoat
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Ronseal Knot Block Primer and Undercoat

Barcode: 5010214864812
Regular price
£11.25 GBP
Sale price
£11.25 GBP
Regular price
Sold out
Unit price
Tax included. Order before 6pm weekdays for premium delivery (1-2 days), only £3.99 or Free on orders over £75

Completely stops wood knots and resins from showing through your paint. It ��������������������������� ��������������������������� s also a primer and undercoat which means you can tackle two jobs at the same time. It covers bold colours and dark marks to give you a flawless finish.

Everything you need in one tin
Guaranteed to block wood knots
Ready to paint over in four hours
Can be used on bare or previously painted wood
Won ��������������������������� ��������������������������� t yellow, crack or peel

Before you start
This primer preps your for painting but you still need to prep for the primer.

Put down dust sheets to protect your floors from paint.


Use 120 grit sandpaper to lightly sand the wood. This will help you get an even finish and ensures the paint sticks.
If you have any loose, flaking or peeling coatings sand them off to reveal the bare wood.
Let the dust settle and wipe it up with white spirit and a cloth.
If you notice any cracks or holes, fill them in.
Give your tin a really thorough stir until it ��������������������������� ��������������������������� s a smooth consistency.
Use a brush and paint it on in the direction of the grain.
Wait four hours for the first coat to dry.
Apply the second coat.
Wait four hours for it to dry and that ��������������������������� ��������������������������� s it, you ��������������������������� ��������������������������� ve finished!

Your brushes can easily be cleaned in warm soapy water.

Remember this is only a primer and undercoat, so you should paint over it.


If you notice damage or your primer has chipped, it ��������������������������� ��������������������������� s easy to repair. Just sand down the area that needs repairing and then apply two more coats. And that ��������������������������� ��������������������������� s it, it ��������������������������� ��������������������������� ll be fixed.


We have a 14-day return policy, which means you have 14 days after receiving your item to request a return.

To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.

To start a return, you can contact us at If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.

You can always contact us for any return question at


All orders are processed within the same day. We will contact you if there are any delays. However, some orders may be despatched within the same day and some may take up to 1 day.

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The order will arrive within 1 business days & will be tracked. Express Shipping is £3.99.


0161 241 6842


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Unit S Highfield Road, Manchester, M38 9ST