Ronseal Knot Block Wood Primer and Undercoat

Name: Ronseal Knot Block Wood Primer and Undercoat
Rating: 4.84 (19 reviews)

4.8/5 (19 reviews)

size

250ml 750ml 2.5L

From £8.14

Quantity

Apply to interior wood to stop knots showing through paint.

Features

An all-in-one white primer and undercoat for a long lasting knot-free base
Prepares bare and previously painted interior wood for top coat paints
Stops wood knots and wood resins showing through your paint
Covers bold colours, dark marks and helps paint to stick
Low V.O.C content

Brand

Ronseal

Drying time

4 hrs

No. of coats

2 coats

Size

250ml, 750ml, 2.5L

MPN

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GTIN

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Overview

Ronseal Knot Block Wood Primer And Undercoat is perfect for preparing bare and previously painted interior wood for painting.

Looking for an alternative stain blocking solution? Try Ronseal One Coat Stain Block
Looking for a one coat primer and undercoat for wood? Try Ronseal One Coat Wood Primer and Undercoat
For other types of interior surfaces, use Ronseal One Coat All Surface Primer and Undercoat
For exterior surfaces, see Ronseal All Surface Primer and Undercoat - Exterior

Preparation

Ensure that wooden surfaces to be treated are clean, dry and free from dirt, dust and any other surface contaminants. Make sure the room temperature is above 10°C. Put down dust sheets to cover any areas that do not need painting.

Lightly sand wood using 120 grit sandpaper in the direction of the wood grain to give it an even finish
Vacuum and wipe wood over with white spirit, being sure to remove any sanding dust, prior to painting
Any instances of wet rot can be treated with Ronseal Wet Rot Wood Hardener, and any existing woodworm can be eradicated with Ronseal Woodworm Killer
Fill any holes or cracks with Ronseal High Performance Wood Filler or Ronseal Multi Purpose Wood Filler

Application

Always do a small test area before beginning any project to assess performance. Follow the manufacturer's instructions on the tin at all times. Stir the contents of the tin thoroughly prior to use.

Apply Knot Block Wood Primer using a good quality synthetic brush in the direction of the wood grain
Allow 4 hours to dry, then apply a second coat

FAQ

When using this on a shed, should I paint both sides of the slats or just the outside?

This product is only suitable for interior use and can't be used on a shed. If you are after an external knot blocking primer, consider a knotting solution such as Barrettine White Knotting followed by Protek Stain Blocking Primer

Can you successfully spray Ronseal Knot Block Primer and Undercoat with an airless sprayer?

We do not recommend spray application, it is best suited to brush or roller application.

Datasheets

Safety Information

5 stars: 16 (84%)
4 stars: 3 (16%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 0 (0%)

Easy to apply and seems to do the job!

The finish is just what we expected. We are very happy with the result is has delivered.

Great product would recommend

This was recommended by a master carpenter, so had every faith it would do the job it was intended for. Easy to apply, low odour and with two coats gives good coverage. Would definitely purchase again and have done just that.

Good product

Covers knots - does what is says on the tin. You will need two coats.

Happy with service provided

Very happy with product and service provided

Great paint

Seems quite thin but I guess that is to soak into the wood to stop the knots showing. Quick sand when dry and ready for 2 coats of top coat. Very pleased with results

Works just as it says on the tin

I had painted a new large pine summer house with primer, undercoat and semi-gloss paints, never thought about knots in the wood, 12 months later hundreds of knots showed through the paint, it looked awful. Found Ronseal Knot Block advised as a remedy, used 2 coats on top of existing paint, then a coat of semi- gloss with perfect results, no sign of knots anywhere, now very pleased with finish, Knot Block does just what it says on the tin, even on previously painted wood, would recommend its use to everyone, just wish I had Known about it and used it on the bare wood and saved all that work and expensive paint.

Too early to enthuse

Not yet sure that this will block knots adequately. it is a different formulation now and it will be at least 12 months before I know whether there is discolouration

Easy to apply and does the job

Good coverage,quick drying,stops knots from reappearing once overcoated with stay white ultra gloss

Does exactly what it says on the tin

Bought this for new skirting board and it works perfectly.

Does what it says

Use two liberal coats to fully seal

Does what it says on the tin!

Does what it says on the tin!

Did the job.

This product certainly covered the knots in a pine chest of drawers.

Well worth the money

I was in two minds as to whether to spend the extra money but Iâ€™m really glad I did. It really does make a big difference when preping the wood.

Does what it says on the tin!

Good product to use. Quick drying. Two coats needed but good base for glossing.

Easy to work with

I've used this material for a number of years, it's very easy to work with and when dry provides a good hard surface for rubbing down. Just remember to give it a good stir before use, I would also recommend turning the tin every few hours when not in use. With the lid on off course.