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Best wood primer from our amazon.co.uk shortlist

Updated: October 2026

Choosing the best wood primer here is less about finding the largest star number than deciding which listing gives you dependable evidence for the job. Our [wood primer comparison](/hub/paints-and-varnishes/wood-primer) contains six tins, including four sizes from Johnstone's, one Dulux option and one Berger product. The Dulux 750 ml tin is our top pick because its review record belongs to that listing and its coverage aligns with the manufacturer's guidance. Johnstone's 750 ml is the better-value choice at its captured price, provided you accept that its review count is shared and its drying information conflicts. These are editorial judgements from listings, UK reviews and public technical information, not results from laboratory testing.

Choosing the best wood primer here is less about finding the largest star number than deciding which listing gives you dependable evidence for the job.

Our top picks

Johnstone's Johnstone's primer undercoat 750 ml

Best overall

Johnstone's Johnstone's primer undercoat 750 ml
7.6/10about £9.92
View offer
Johnstone's Johnstone's primer undercoat 2.5 litre

Rank 2

Johnstone's Johnstone's primer undercoat 2.5 litre
7.2/10about £23.99
View offer
Dulux Dulux wood primer and undercoat 750 ml

Rank 3

Dulux Dulux wood primer and undercoat 750 ml
8.1/10about £17.24
View offer
On this page
  1. 1.What best means in this set
  2. 2.Dulux 750 ml: the top pick
  3. 3.Johnstone's: choose by size, not review count
  4. 4.Who should skip a tin

What best means in this set

We prioritised a clearly identified base, relevant surfaces, coherent coverage, usable drying information, sufficient review evidence and a sensible shelf price. A five-star average does not automatically win. Berger's 5.0 came from one rating, while Dulux's 4.6 came from 1,944 reviews attached to its own ASIN. If the bullets say one to two hours but an attribute says 15 hours, the delivered label must take priority. None of these six listings claims to block knots or tannin. Use our wood primer undercoat buying guide if you have not yet decided which type of first coat the job requires.

Dulux 750 ml: the top pick

Dulux Primer & Undercoat for Wood, ASIN B002E2JX4G, was listed at £17.24 for 750 ml. Its acrylic base and wood surface recommendation are clear, while its coverage of 12 m² per 750 ml per coat works out at roughly 16 m² per litre and matches Dulux's retail guidance. Both the listing and the brand information point to a two-hour drying interval. Its review evidence is independent of the Johnstone's variation family: 4.6 from 1,944 amazon.co.uk reviews. UK reviewers describe use on a new external timber door, stairs and kitchen wood. Reviews also mention strong smell, thin coverage and yellow-brown bleed. The stated weight of 408 g looks too low for a 750 ml tin, and the listing names wood rather than metal.
Johnstone's Johnstone's primer undercoat 750 ml

Testsieger

Johnstone's Johnstone's primer undercoat 750 ml
7.6/10about £9.92
View offer

Johnstone's: choose by size, not review count

The Johnstone's 750 ml primer undercoat, ASIN B084X87QCR, was £9.92 and is our best value option. It is described as water-based and suitable for wood and metal, and UK reviews cover doors, window frames and radiators. Its 4.6 score from 6,050 reviews is repeated on the larger ASINs, so it is a parent count rather than separate proof for each pack. Its dry-time attribute says 15 hours while the bullets say one to two hours. At £23.99, the 2.5 litre tin is about £9.60 per litre, but do not plan from its 13 m² per tin wording. The 250 ml tin costs £9.56, only 36p less than the 750 ml version.

Who should skip a tin

Skip Berger Wood Primer, ASIN B008Y0OMKM, unless the seller or physical tin resolves its base. The listing describes it as oil-based or water-based. Its £11.04 price for 750 ml is not enough compensation when Johnstone's is cheaper and clearer about being water-based. Do not treat Berger's 5.0 score as stronger evidence. It came from one rating and the captured listing contained no written review. Skip the 250 ml tin for a whole door, and skip the 2.5 litre pack for a small repair. All six should be bypassed as a standalone answer to resin or tannin. Read our guide to knots bleeding through paint before painting knotty pine or oak in a pale colour.

Common questions

Which is the top pick in this set?
The Dulux 750 ml tin is our top pick because it has 1,944 reviews attached to its own listing and a coverage rate consistent with Dulux's guidance. It suits wood-only jobs where clearer evidence justifies the higher £17.24 captured price. It is not a knot blocker or a metal primer.
Which offers the best value at 750 ml?
Johnstone's 750 ml was listed at £9.92, compared with £17.24 for Dulux, and it names both wood and metal. That makes it the value choice. Its 6,050 reviews are shared across sizes, however, and its one-to-two-hour bullet conflicts with a 15-hour attribute.
Is the 2.5 litre tin better value?
At the captured £23.99 price, the Johnstone's 2.5 litre tin costs about £9.60 per litre, the lowest rate here. It is better value only if you need that volume. Do not plan from its 13 m² per tin wording because the same phrase appears on smaller packs.
Why do three Johnstone's sizes show 6,050 reviews?
Amazon variation families can share ratings and reviews between sizes. The 750 ml, 1.25 litre and 2.5 litre files show the same count and opening reviews, so the number should be read as evidence about the product family rather than independent evidence for each volume.
Is Berger's 5.0 rating a reason to buy it?
Not by itself. The score is based on one rating, with no review text in the captured listing. The base is also unresolved as oil-based or water-based. Confirm the binder and directions before considering it alongside products supported by substantially more evidence.
Is the 250 ml Johnstone's tin worth £9.56?
It may be worth it for one very small patch where avoiding leftovers matters. For larger work, it is difficult to justify because the 750 ml version was only 36p more. Measure the job and check current prices before choosing convenience over volume.
Does the Dulux top pick stop knots?
The listing does not claim that it does. One UK review describes yellow-brown bleed, and Dulux Trade guidance says knots should be treated before primer undercoat. Use a compatible knot or stain blocker, then apply primer and topcoat as directed.

Related pages

Exterior wood primer for joinery

Wood primer

Wood primer undercoat: the right first coat to buy

How to prime bare wood before the finishing topcoat

Knots bleeding through paint on pine, oak and doors

Sources

Public UK sources used for the VOC, lead-paint and preparation points on this page. Prices, stars and review counts are from the amazon.co.uk listings on 16 October 2026.

  1. VOC in Paints Regulations 2012 (retrieved 16 October 2026)
  2. HSE CIS79 — old lead paint (retrieved 16 October 2026)
  3. GOV.UK — lead information for the public (retrieved 16 October 2026)
  4. Dulux — Primer and undercoat for wood (retrieved 16 October 2026)
  5. Dulux Trade — quick-dry wood primer undercoat sheet (retrieved 16 October 2026)
  6. Johnstone's — primers (retrieved 16 October 2026)
  7. Screwfix — primer and undercoat (retrieved 16 October 2026)
  8. BS EN 927-1:2013 — exterior wood coatings (retrieved 16 October 2026)