Osmo WR Base Coat (4001)

  4.7/5.0   86 reviews

You'll need enter area above for 1 coat (Recommended)

Wood type and application can vary coverage

  • New improved formula that replaces the old Osmo WR Base Coat 4005
  • Recommended in conjunction with exterior wood oils
  • Protects against mildew, rot, blue stain and wood boring insects
  • Greatly extends the life of softwoods and pines such as spruce, fir and hemlock
  • Penetrates deeply into the wood to repel water and reduce the risk of swelling and shrinking
  • Prevents swelling and shrinkage of timber
  • Dries to a clear finish
  • A unique combination of oil and water
  • Low odour formula
Brand Osmo
No. of coats 1
Coverage Up to 6 per litre
Drying time 12 hrs
Size 125ml, 750ml, 2.5L
MPN 4001A, 4001C, 4001D
GTIN 4006850103959, 4006850101863, 4006850900763

Osmo WR Base Coat (4001) is an exterior wood preservative for use on wooden surfaces that require protection against blue stain (EN 152), wood rot (EN 113) and wood-destroying insects (EN 46). It can be used on most exterior wooden surfaces including windows, frames, roller shutters, doors, pergolas, trellis and garden furniture.

Wood to be protected must be dimensionally sound and stable and not in direct contact with the ground.

  1. Wood surface must be clean, dry and frost-free (moisture content max. 20%) prior to application of Osmo WR Base Coat
  2. Clean old microporous stains thoroughly
  3. Old paints and lacquers must be completely removed to expose clean, bare wood
  4. Degrease bare wooden surfaces with meths if required

Always do a test area before starting any project to assess suitability and compatibility. Stir well before use. Osmo WR Base Coat is ready to use and does not require thinning.

  1. Apply WR Base Coat by brushing, dipping or flooding
  2. Only spray apply in an enclosed unit
  3. Coat the clean, dry and frost-free wood generously
  4. Apply to all sides of the timber before fitting if possible

Please Note: This product is not for use on wood which comes into direct contact with food or animal feed. Also not for use in living spaces or habitable rooms. Do not use in immediate proximity of any kind of water.

Osmo WR Base Coat is intended as a protective base coat for exterior oil based products. It is therefore essential that it is over-coated with either an Osmo exterior wood oil or other suitable exterior wood oil.

86 customer reviews
OSMO are the best - By Far! by Paul Crow

I always use Wood Finishes - they are very competitive on price & product arrives quickly & on time. I use a number of OSMO products - they are the best - recently tried Ronseal for akitchen worktop & no it doesn't do what it says on the tin, but OSMO does

Reviewed 2.5L on: 05/01/18
Seems to do the job by Christopher Hayton

Time will tell, but great service and the products went on well.

Reviewed 2.5L on: 22/12/17
Easy to apply; is absorbed evenly by Richard Taylor

Works equally well on previously-painted surfaces I've sanded, as well as on new doors.

Reviewed 750ml on: 03/11/17
Confidence inspiring so far by Alex Wills

Wood finishes were extremely helpful and informative. The product seems very good and went on very well, the whole Osmo system seems very confidence inspiring and my experience so far has been a good one

Reviewed 2.5L on: 30/10/17
Excellent product If your joinery has cost thousands then this is a small investment to help it last forever by Frazer Smith

Easy to apply. Essential preparation prior to applying osmo topcoat.

Reviewed 2.5L on: 26/10/17
Great product by Jane Harrod

Went on easily and worth the money.

Reviewed 2.5L on: 21/10/17
Excellent product by Peter Stallard

This base coat is excellent, forget Ronseal and all those other products, this is the stuff, good coverage, expensive but well worth it

Reviewed 2.5L on: 18/10/17
Very easy to use by Ricky Woodgate

Over stains well. time will tell but we are very pleased with your products.

Reviewed 2.5L on: 17/10/17
Easy to apply by Jane G

Used on my sun damaged front door. This took quite a while to dry even on a warm day but wood looked much better.

Reviewed 750ml on: 20/09/17
Osmo Base coat - excellent by Stephen Lympany

I used this on a project (oak) 6 or 7 years ago - seemed to work well, so I'm using it on another oak project.

Reviewed 2.5L on: 17/09/17
Quick delivery excellent customer service thank you by Tayar

Quick delivery excellent customer service. thank you

Reviewed 2.5L on: 07/09/17
Use this first by Mrs PJ Green

Definitely worth the effort and extra cost, this garage has to last!

Reviewed 2.5L on: 28/08/17
Worked well by Andrew Fry

Easy to use. How well it works will be seen over time!

Reviewed 2.5L on: 14/08/17
Good coverage and easy to apply by Martin Pugh

Managed to give all cladding on 4mtr x 3mtr summerhouse two coats on both sides using two 2.5 ltr tins. Had to brush in quickly on hot days in order to see where we had covered as it dried in very quickly.

Reviewed 2.5L on: 13/06/17
Very fast service, and good advice by Mr Scott

Very good product, looked amazing one the wood had been coated using the base coat, followed by x2 coats of the product.

Reviewed 2.5L on: 02/06/17
Excellent by David Rollin

I bought this to apply a first 'primer' coat to my new 5 foot Alexander Rose garden bench. I was worried the 125ml tin was too small however it was just enough to coat all parts of the bench. It is a brilliant product.

Reviewed 125ml on: 21/05/17
Excellent coverage and ease of application by Mark Sheridan

Applied to the decking with a paint brush goes on very easy almost like water, covers an awful lot of decking 30square meters in my case

Reviewed 2.5L on: 21/05/17
Good result by Cms

Good coverage and really sinks into the wood.

Reviewed 2.5L on: 20/05/17
Sticky for a good few hours but waterproof imediately ! by Mr Neil Caunce

Goes on well - dries leaving a wet wood finish was waterproof immediately . Looks really good on larch

Reviewed 750ml on: 28/04/17
Not applied yet as it is not clear that this is the best product for my exterior table to by Mr JATINDER SAHOTA

Not applied yet as it is not clear that this is the best product for my exterior table to

Reviewed 750ml on: 29/03/17
A note from us...

Hello Mr Sahota,

If you need any advice on the product or your project please feel free to give us a call on 0800 7818 123 and one of our friendly advisers will be happy to help.

Kind regards Samantha.

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