Sadolin Extra Durable Clearcoat

  4.7/5.0   67 reviews

You'll need enter area above for 2 coats (Best Protection)

Wood type and application can vary coverage

  • A high quality clear coat finish for softwood and hardwood windows, doors and conservatories
  • Ideal as a top coat for Sadolin Classic Wood Protection and Sadolin Extra Durable Woodstain
  • Extremely durable and flexible
  • Protects timber from rain, moisture and UV damage
  • Helps prevent blistering and flaking
  • Provides long lasting protection
  • Offers a gloss or satin finish
Brand Sadolin
No. of coats 1-2
Coverage Up to 12 per litre
Drying time 24 hrs
Size 1L, 2.5L
MPN 5040852, 5051842, 5051844, 5051845
GTIN 5010131476211, 5010131485442, 5010131485459, 5010131485466

Sadolin Extra Durable Clearcoat is perfect for a wide range of exterior wood projects including windows, doors and conservatories. It is ideal for over-coating Sadolin Classic Wood Protection and Sadolin Extra Durable Woodstain.

Please Note: This product is not suitable for high traffic areas such as flooring and decking.

Ensure all timber surfaces to be treated are fully clean, sound and dry. The moisture content of the timber should not exceed 18% prior to coating.

Bare Timber

  • All traces of surface dirt and debris, including mould, algae and fungi, must be removed prior to application with a scraper, stiff brush or broom
  • Areas affected by biological growth should be treated with a suitable mould and mildew cleaner
  • Resinous deposits should be removed with a scraper
  • Always degrease any exposed bare timber surface by wiping with a soft, lint-free cloth dampened with methylated spirits
  • Any defects in the wood should be filled with Sadolin Wood Filler or Sadolin Stainable Wood Filler
  • Only use non-ferrous screws, nails and fixings

New Timber

  • Pre-treat new timber with a suitable preservative , such as Sadolin Quick Drying Wood Preserver, for best protection
  • Where possible, the wood preservative and Clearcoat should be applied to all parts of the wood prior to fixing in place

Previously Coated Wood

  • Where there is localised damage, or deterioration has occurred as a result of exposure of the factory coating for longer than 3 months, affected areas should be thoroughly sanded back to a sound substrate and re-coated
  • Previously coated wood in good condition should only require a light sanding to aid with adhesion
  • Wash down with warm water and detergent, allowing to dry before application of Sadolin Clearcoat
  • For surfaces in poor condition, remove any loose, flaking material and any grey, weathered timber by thoroughly sanding in the direction of the wood grain
  • Do not break through the surface coating
  • Ensure that all surface dust and debris from sanding is removed before coating with Extra Durable Clearcoat

Base Stained Joinery

  • If bare, joinery should be patch primed with one or more coats of Sadolin Classic Wood Protection in the appropriate colour to match the existing base stain


  • The backs of new glazing beads, end grains and rebates should be brought to a finish with the full Sadolin Extra Durable Clearcoat system prior to fixing
  • The use of linseed oil putty or modified, non-setting compounds are not recommended in conjunction with Sadolin wood protection systems
  • To confirm compatibility, please consult the manufacturer of the relevant glazing material
  • Silicone glazing materials should only be applied upon completion of the finishing coats

Applying Sadolin Extra Durable Clearcoat

Always do a small test area before starting any project to assess product suitability, adhesion and end result. Follow the manufacturer's instructions on the tin at all times.


Do not apply Sadolin Clearcoat if there is a risk of rain, or when air / substrate temperatures are below 8℃ or above 25℃ or if the relative humidity is above 80% during application or drying periods. Protect from frost and rain until dry. Failure to meet these requirements may adversely affect the drying, visual quality and durability of the finish.


  1. Ensure clear coat is thoroughly stirred before and during application
  2. Apply Sadolin Extra Durable Clearcoat with a good quality, natural bristle brush
  3. Apply in a full flowing coat, ensuring all surfaces and end grains are fully coated
  4. Pay special attention to end grain, tops and bottoms of doors, and undersides of sills
  5. Allow a minimum of 16-24 hours drying between coats
  6. Apply second coat as above
  7. If applying this product on its own without a base coat, 3 full coats are advised

Please Note: The amount you need may vary depending on surface condition, moisture content, method of application and climatic conditions during application.

Regular Cleaning

For regular cleaning, wooden surfaces can be wiped down with a dampened, lint-free cloth and warm, soapy water.


The need for maintenance is indicated by a lightening in colour, reduction in sheen as the coating erodes, and a loss of water repellent qualities.

When the layer of finish is getting thin, simply wash down with warm, soapy water (mild detergent) and re-coat with 1 or 2 coats of Sadolin Extra Durable Clearcoat.


  1. When removing organic growths, or greying in the wood, treat with a suitable fungicidal solution and lightly sand the surface
  2. Patch prime the areas where sanded with Sadolin Quick Drying Wood Preserver
  3. After, simply add 1 or more coats of Sadolin Classic Wood Protection or Sadolin Extra Durable Woodstain in the appropriate shade to match existing colour
  4. Then overcoat with Sadolin Extra Durable Clearcoat

If the finish is badly flaking or peeling, to the point where the bare wood is showing through or has started to grey, lightly sand and follow the full Preparation and Application instructions above.

Q. Can Sadolin Extra Durable Clearcoat be used on decking?

A. Sadolin recommend that Extra Durable Clearcoat is not used on decking due to its high surface build and shiny finish. This product is likely to wear quicker than a dedicated decking stain or oil and could pose a slip hazard.

67 customer reviews
Goes on well with a brush by Chris Rogers

Went on well with my new brush. Pleased with the finish.

Reviewed 1L, Gloss on: 04/01/18
Easy to use and provides a good finish by John Hood

I have used Sadolin products over the years and always found them excellent . They give good coverage good protection and are easy to use. This product does exactly this.

Reviewed 2.5L, Satin on: 31/10/17
Adds that extra class finish by Mr R McConnell

If this product protects the wood as it did the last time I used it, and there's no reason why it shouldn't, then happy days.

Reviewed 2.5L, Satin on: 16/10/17
Great, but needs care by Matthew Rayner

Sadolin was recommended by the suppliers of my substantial timber outbuilding that is used for business purposes. Sadolin is quite a sensitive material and requires care in application, but the results are worth it, even for the cost. After 6 years, the building looks as good as new - varnished with a warm honey glow. My experience is much like the manufacturer's recommendations: - Best results come when applied to fully dry wood in weather that is warm/dry but not hot (usually August, early September) - Don't try and paint over cracks or greyed wood, always sand back to fresh wood and re-apply. - I strongly recommend three coats, this comfortably lasts two years before a maintenance coat. You can feel that the coating is beginning to break down as, initially, it feels like the building is coated in plastic, then it slowly becomes rougher. I am not sure how many times you can apply the maintenance coat until it needs full strip and re-coat. - Care should be taken with the the south face of any building as, in the UK, this generally gets peak sun and the majority of rain. It may require more frequent maintenance. I should also mention the Technical Help people at Crown (who make Sadolin), who were most helpful. I think there is also a video on the product and how to apply it on Youtube. Good luck!

Reviewed 2.5L, Satin on: 09/07/17
Annoying by Pete

I realise i'm in he minority here, but i found this product bloody frustrating It seems to require very rapid application to avoid boundary marks It crawls up the brush very quickly and starts to dry into a lump there almost immediately Brush strokes are really hard to avoid 5 minutes after opening the tin, a skin starts to form

Reviewed 1L, Satin on: 11/05/17
A note from us...

Hello Pete,

I am sorry to hear that you had this issue with the product, it doesn't sound right at all. Are you able to email me with details of the problem that you had, the method of of application and the conditions and some details of the project itself. I will be happy to offer some advice.

Kind regards Samantha.

Applies easily and gives an excellent finish by Mr David Turnell

I find curing times can be longer than expected and odour is quite high but the end result is very good. It's only been 3 months since I applied this to an exterior door so I don't yet know how durable it will be but so far it's looking good.

Reviewed 2.5L, Satin on: 25/04/17
Not for humid areas, but good otherwise by Elizabeth Saxon

We used this on the exterior of our swimming poolhoue and over the period of a few months with the humidity it ran down the glass and was incredibly difficult to get off. However, we also used it on our oak gym building and it looks great

Reviewed 2.5L, Satin on: 30/10/16
Ease of use by Mrs Rose Alford

Sadolin clear coat is a doddle to use, yet leaves a professional finish.

Reviewed 2.5L, Satin on: 18/10/16
Its Sadolin by Adrian Gwenter

Pay a bit more, get a better product, goes on lovely and lasts!

Reviewed 1L, Satin on: 19/09/16
Easy to apply and leaves a very good finish by Bill Davies

Have used other makes of wood varnish in the past and I think this is the best one I have used for ease of application and overall finish.

Reviewed 2.5L, Satin on: 18/09/16
Great product by Paul Ray

Very easy to apply. Applied three coats to new oak doors, produced a great finish.

Reviewed 2.5L, Satin on: 13/09/16
It came very quickly, well packed, all satisfactory now by Colin Spraggs

I needed good weather to arrive and got the 2nd coat pronto on a new 12ft x 6ft shed which really looks the part now! The manufacturer use your products and recommended us to do the same which was good advice.

Reviewed 1L, Gloss on: 05/09/16
Great coverage and an excellent finish Time will tell about how hard wearing the clear coat is, but I've bought several Sadolin products in the past and am yet to be disappointed! by Rob Taylor

Easy to paint on and the door looks fantastic. Without a doubt I would recommend Sadolin extra durable clear coat. 10/10

Reviewed 1L, Satin on: 24/08/16
Very reliable and durable by John Shenton

I have used this product outside for several years and found it to be tough and does not peel or lift. Now trying it for marine use.

Reviewed 2.5L, Gloss on: 20/08/16
Excellent clearcoat finish by Geoffrey Schoon

Product tends to take quite a long time to dry and is prone to leave brush marks but not much else like this on the market

Reviewed 1L, Satin on: 05/08/16
Goes on with ease by Robert Armstrong

Only used once for a table I built but seems to be just what I wanted it for

Reviewed 1L, Gloss on: 27/07/16
Have used this before - will use it again by BobP

Great wood protection if used as described on the tin. I used it on a log cabin purchased new 7 years ago. I applied Sadolin woodstain followed Sadolin clear coat. I have applied a coat of Sadolin clear coat every other year since then. Cabin looks great.

Reviewed 1L, Gloss on: 12/07/16
Quick delivery by Terry B

Sadolin products are always good in my experience

Reviewed 2.5L, Satin on: 10/07/16
Great protection - easy to apply by BobP

Have used Sadolin wood stain and clear coat to protect a log cabin which is now 7 years old. The protection from the weather has been excellent. It is easy to apply and does not flake.Follow the instructions and you can't go wrong.

Reviewed 2.5L, Satin on: 28/06/16
Used for a final finish on exterior woodwork such as wooden shutters, by Trevor Spires

Expensive but easy to use, gives a good finish and lasts very well even when exposed to the worst of the winter weather and the hottest summer sun on a house in France.

Reviewed 2.5L, Satin on: 24/06/16