Cuprinol Exterior Wood Preserver 5L

  4.9/5.0   19 reviews
You'll need enter area above for 2 coats (Standard Protection)
You'll need enter area above for 3 coats (Ultimate Protection)

Wood type and application can vary coverage

  • A water-based exterior wood preserver for all sawn wood
  • Perfect for sheds, fences, cladding and more
  • Can be used on previously pressure treated and tanalised wood
  • Water-repellent properties protect against weathering
  • Prevents wood rot, decay and blue stain
  • Quick drying formulation
  • Low V.O.C content
Brand Cuprinol
No. of coats 2-3
Coverage Up to 5 per litre
Drying time hrs
Size 5L
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.

Looking for an alternative wood preservative treatment? Try one of the following products from the Cuprinol range:

Product Use
Cuprinol Ultimate Garden Wood Preserver A water-based wood preservative for garden timber. Perfect for sheds, fences, summerhouses and garden gates
Cuprinol Wood Preserver Clear (BP) A clear, multi-purpose wood preservative for interior and exterior use on all sound timbers, including structural timbers and joinery
Cuprinol One Coat Sprayable Fence Treatment A water-based, sprayable wood treatment for garden fences and sheds, which colours and protects rough sawn timber
Cuprinol 5 Star Complete Wood Treatment (WB) A clear, water-based, all-in-one wood treatment for interior timber. Rids wood of dry rot, wet rot, fungi and woodworm

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

Bare or New Timber

Previously Coated Timber

Existing surface coatings such as paint or varnish must be fully removed back to bare wood before using Cuprinol Exterior Wood Preserver, either by sanding or using Cuprinol Stain Stripper.

Always do a small test area before beginning any project to assess the appearance and suitability of the finish. Follow the manufacturer's instructions on the tin at all times.

Please Note: Cuprinol Wood Preserver is not suitable for use on beehives and other beekeeping 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.

This product is not suitable for spray application. Shake or stir thoroughly before and frequently during use to ensure an even colour.

  1. Apply 2-3 coats or Exterior Wood Preserver with a Cuprinol Woodcare Brush in the direction of the wood grain
  2. Allow 4 hours drying time between coats
  3. For best coverage and protection, three coats are recommended

Cuprinol Exterior Wood Preserver can be used as a standalone product or over-coated with a clear exterior wood finish if required.


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

19 customer reviews
It did exactly what it was supposed to by Pauline Kershaw

the product was easy to use and it went on easily and went a long way.very good value for money

Reviewed 5L, Chestnut on: 16/11/17
Used for many years Very good for multi-coats if it is not left to fully harden by Mr R Sullivan

Originally had doubts about a water-based product but have, surprisingly, found it superior to the oil based version. Highly recommended.

Reviewed 5L, Chestnut on: 22/10/17
Great product easy to use and long lasting by Mr Stokes

Great product easy to use and long lasting

Reviewed 5L, Chestnut on: 19/09/17
Exactly right for fence job we did by Julie Newson

Very good ..have always used this brand

Reviewed 5L, Chestnut on: 25/08/17
Very good quality by Mr Mike Pickett

Easy to use does what it says on the tin

Reviewed 5L, Acorn Brown on: 13/07/17
Goes on light dries dark by Gordon Jenkinson

First class product water based but very water repellent when dry.

Reviewed 5L, Chestnut on: 21/04/17
A superior lasting product when compared with others by Mr A White

In an exposed coastal area I've tried numerous other products on a selection of different types of wooden sheds. Cuprinol has proved to be the best product I have found to protect and waterproof the exterior of the sheds.

Reviewed 5L, Chestnut on: 01/02/17
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 5L, 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 5L, 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 5L, 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 5L, Rustic Green on: 15/10/16
Great product great colour by Shawn Erhardt

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

Reviewed 5L, 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 5L, 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 5L, 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 5L, 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 5L, Acorn Brown on: 19/05/16
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 5L, 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 5L, 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 5L, Black on: 27/09/15