Cuprinol Exterior Wood Preserver - 5L

  4.6/5.0 (14 reviews)
On-screen colours may vary according to different screen calibrations. We therefore always recommend applying a test area.
2 coats = Standard Protection
Total: enter area
3 coats = Ultimate Protection
Total: enter area

Wood type and application method can vary coverage.

  • Water-based exterior wood preserver for all sawn wood
  • Perfect for sheds, fences, cladding and more
  • Water-repellent
  • Prevents wood rot, decay and blue stain
  • Quick drying
  • Can be used on previously pressure treated wood and wood treated with a wood preservative
Brand Cuprinol
No. of coats 2-3
Coverage Up to 5 per litre
Drying time hrs
MPN 5095360, 5095361, 5095363, 5095366, 5095368
GTIN 5010212545874, 5010212545881, 5010212545904, 5010212545935, 5010212545959

Cuprinol Exterior Wood Preserver is suitable for the treatment of most exterior wooden surfaces including structural greenhouse timbers and timbers in close proximity with plants (not seed boxes). Extra thorough drying must be allowed under service conditions before introducing plants.

For interior timber, consider Cuprinol 5 Star Complete Wood Treatment (WB).

Ensure that all wooden surfaces to be treated are clean, dry and free from surface dirt, debris and other surface contaminates.

  • Traces of mould, algae or fungi must be removed and treated with a suitable fungicidal wash or mould and mildew cleaner.
  • Surface coating such as paint or varnish must be removed fully before application of this product by sanding the timber back to clean bare wood.

Always do a test area before starting any project to test appearance and suitability of the product on the timber to be treated. Follow the manufacturer's instructions on the tin at all times.

Please Note: This product is not suitable for use on Beehives and other Bee keeping equipment. Timber treated with this product will not be suitable for paint, varnish or wood stain finishes. The colour of treated wood may be affected by type and condition of wood and may be modified by previous treatments.

  1. Shake or stir thoroughly before use and frequently during use to ensure even colour.
  2. This product should be applied by brush only, not suitable for spraying.
  3. After suitable preparation apply 2-3 coats of Cuprinol Wood Preservative.

For best coverage, three coats of this product are recommended.


To maintain the surface finish and its protective properties, re-apply a fresh coat of Cuprinol Exterior Wood Preserver as and when required, following the Preparation and Application instructions.

14 customer reviews
Quality product from a good firm by Karen Armitage

Leaves a decent finish - but when you fist apply it dos go on a rather strange colour!

Reviewed Chestnut on: 23/11/16
Wouldn't be without this for all my out door furniture, year in, year out by Mark Wilkins

I was recommended this product from my local building company when they were building a wooden garage, next to my stable block. The application is so easy, stir and apply with brush or roller onto new treated wood, and it goes on like water. Fantastic, fast coverage and weather dependant, dries quickly ready for the next coat. 5 litres goes along way, and I now use it for all my various benches, garden tables and chairs. It darkens on the second coat, and you can see its water resistance when raining.Incredible product, and pound for pound, fantastic value. Quite simply if it was ever discontinued, I'd be lost.

Reviewed Chestnut on: 15/11/16
So far, so good In fact excellent! by Robert Justham

See review of the same product in Rustic Green.

Reviewed Chestnut on: 15/10/16
So far, so good In fact excellent! by Robert Justham

Having previously used the solvent-based Cuprinol Wood Preservative on Siberian Larch cladding when the time (eight years) came to re-treat the boards I was concerned to learn that the product had been replaced with a water-based preservative. However, having now carefully prepared the surface and applied three coats of the new treatment, I am very impressed with the results. We shall be interested to see how it withstands weather over the next eight years!

Reviewed Rustic Green on: 15/10/16
Wood preserver by Selina Musters

Repelled rain well

Reviewed Rustic Green on: 01/10/16
Great product great colour by Shawn Erhardt

I always use this product as its a great price and does the job just great

Reviewed Rustic Green on: 21/08/16
Good colour, easy to apply on well prepared surface by Ray Collier

Cuprinol is a good manufacturer of outside coatings, and I am very pleased with the colour and finish.

Reviewed Golden Brown on: 05/08/16
Excellent product by Oliver Belson

Good coverage water based preservative - the chestnut comes up pretty dark - darker than you might think and if painted on liberally can be almost black. Looks great, easy to clean - you must keep it stirred though. You can spray paint with it despite what it says on the tin...

Reviewed Chestnut on: 07/07/16
Always had 1st class results with Cuprinol products by Paul

I have never had a bad experience with Cuprinol products. Provided you pick the weather and re-coat in the time frame stated on the tin then the job will always go well and you should have a top class finish that lasts for years. The black looks superb on rough finished timber clad barns and outbuildings (feather edged board) and gives a nice finish without too much shine.

Reviewed Black on: 31/05/16
Easy to apply and clean up A toned down shade of acorn brown compared to spirit based by Fencepainter

I by mistake ordered the water based version of this preserver. I was half way along the fence with the spirit based version. The colours were so different that I ordered another can of spirit based. Both were labeled acorn brown. Otherwise easy to apply and clean up (used in on side that did not show).

Reviewed Acorn Brown on: 19/05/16
I purchased the wrong product by Clive Goodkind

Very poor choice Water based products do not penetrate . I had to buy solvent based product to achieve full penetration of the wood

Reviewed Acorn Brown on: 05/05/16
Keeps it's colour over many years by David Kjaer

Easy to apply and soaks right into the wood and retains it's colour for many years before it starts to fade!

Reviewed Acorn Brown on: 05/12/15
Very good coverage and colour by Maureen

Very good coverage and colour. Gave exactly the finish I wanted.

Reviewed Rustic Green on: 04/11/15
Easy to apply & a great looking finish, by Tim Davies

Great product. A bit concerned when it appeared grey when applying but dried to a rich black. Perhaps Cuprinol should consider stating this on the tin.

Reviewed Black on: 27/09/15