Ronseal Knot Block White Wood Primer & undercoat 0.25L

Product rating
1.2 out of 5 stars
Product code:
5010214870356

Current price

£7 was  £9.00

you save  £2.00

£28 per L

Ronseal Knot Block White Wood Primer & undercoat 0.25L

Product code:
5010214870356
Ronseal Knot Block White Wood Primer & undercoat 0.25L Ronseal Knot Block White Wood Primer & undercoat 0.25L

Current price

£7.00 was  £9.00

you save  £2.00

£28 per L

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Product Details

Product Information

Apply this primer & undercoat from the Ronseal Knot Block range to interior , using a brush, to prepare the surface for painting. It takes 6 hours to dry and will cover Up to 12 m² per litre on average.

Features and Benefits

  • Stops wood knots showing through paint
  • Covers bold colours, dark marks and helps paint to stick
  • Ready to paint over in 4 hours
  • Control air pollutants by choosing products with lower solvent levels.
  • Stops wood knots showing through paint

Technical Specifications

Technical specification of Ronseal Knot Block White Wood Primer & undercoat 0.25L
Brand Ronseal
Range Knot Block
Colour description White
Paint type Primer & undercoat
Coverage Up to 12 m² per litre
Durability Undercoat & knot blocking in one, ensuring a longer lasting knot free topcoat finish
Drying time 6 hours
Recoat time 6 hours
Location Interior
Paint/Stain/Varnish base Solvent-based
VOC description Low
Application Brush
Colour group White

Health and Safety

Please note that this item has additional safety or regulatory datasheets available. The product may have possible health and safety hazards covered in these documents. Refer to the container for full information and always follow the instructions.

Help & Advice

Buying guides

Primer buying guide

Primer buying guide

If you're painting on bare wood, plaster or metal surfaces, you'll get a better result if you use a primer first. It provides a surface which the paint can bond to and stops the paint being absorbed. Find out more what you need and for what surface.

Reviews 1.2  out of 5 stars

Ronseal Knot Block White Wood Primer & undercoat 0.25L is rated 1.3 out of 5 by 8.
  • y_2018, m_9, d_24, h_3
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Rated 2 out of 5 by from If only the lid was better quality! I bought a tin of this, the paint has done exactly what I wanted, we painted new wood years ago and the knots have seeped and we have brown spots on our woodwork, this has completely covered the stains up. The tin however, is really flimsy, the lid has just completely bent rather than be prized open. Very poor quality for the £12 we paid.
Date published: 2018-04-08
Rated 2 out of 5 by from 3 coats needed Poor opacity so requires 3 or more coats to cover reasonably well i.e. not really an undercoat. Has then worked to block knots though. Most annoying is the poor quality tin lid. On subsequent use the lid lip just bends and the lid requires pliers to remove!
Date published: 2015-10-29
Rated 1 out of 5 by from After 2 years After 2 years of using this knots from the wood are showing through so have to redo all the woodwork through my house. Not happy
Date published: 2017-09-30
Rated 1 out of 5 by from White water Doesn't do anything it's says on the tin. Waste of time using it.
Date published: 2017-09-30
Rated 1 out of 5 by from Rubbish Used this product on a whole house refurb, All brand new woodwork throughout doorframe doors the lot. Knots are bleeding through and paintwork now looking yellow and streaky due to wood showing through. Awful product. Now have to repaint a whole house in less then 9 months.had to give a 1 star rating to give a review when in reality it deserves a minus 5
Date published: 2017-03-27
Rated 1 out of 5 by from Simply does not work I applied this as per the instructions and initially the knots weren't visible. After a few months the knots started bleeding through the top coat and a year on the woodwork looks dreadful. This product seems to work no better than standard primer - but costs a lot more. I contacted Ronseal but they were not intersted in knowing that their product does not work. I'm now left with days of work to sort out the mess. My advice is stick to the old trusted Shellac Knotting Solution
Date published: 2015-10-02
Rated 1 out of 5 by from Poor coverage I bought this product to go on bare wood but it took so many coats to cover the colour of the bare wood and even then I wasn't happy about it Don't rate it at all, I thought you could trust Ronseal but obviously not.
Date published: 2015-09-23
Rated 1 out of 5 by from Not very good Bought this as i thought would be the best thing to cover new knotted would for skirting and architrave around doors - Put on 3 coats and then covered with a once coat gloss and i can still see knot marks through the paint. i wouldn't recommend this - as a cheaper product would be just as good, in this case Ronseal doesn't do what it says on the tin!
Date published: 2015-04-25
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