revive a composite front door with Polytrol

How to revive a composite front door

Paul at Dunne & Sorted got in touch when he was looking for a product to revive a customer’s faded composite door and we recommended Polytrol. He’s sent us some photos of the project before and after he’d completed it and some instructions on how he did it.

For more information about Paul and his company please see his bio below. We couldn’t wait to see the photos and share them with our other customers. I’m sure you’ll agree that the transformation is nothing short of marvellous!

revive a composite front door with Polytrol

1. Prepare the surface

Firstly, prepare the door. Remove any dirt, grease, grime or mildew from it. If there is any wax or polishes on the door, you will also need to remove this.

Clean the door with warm, soapy water then rinse thoroughly.

Although we didn’t have any mildew on the door, if you do, don’t worry. Mildew can be treated with a 50:50 bleach and water solution. Just scrub it on, leave it for 10-15 minutes, then rinse it off.

After cleaning, leave the door to dry for 24 hours before applying Polytrol. Make sure that your door is completely dry before moving on to the next step!

2. Apply the Polytrol

Liberally apply Polytrol with a brush (you could also use a cloth) and then leave it to work for 10-20 minutes. Before it starts to become tacky, wipe off any excess with a clean, lint-free cloth.

Then leave it to dry.

The door didn’t take us longer than 20 minutes so we could do it all in one go but if it will take you any longer than 20 minutes, you will need to work within areas that can be completed within this time-frame.

To achieve the shiny finish, buff the surface with a lint-free polishing cloth.

3. Clean up

After finishing, clean the brush with white spirits.


This satisfied customer used Polytrol to revive their composite front door but it is also great for a wide range of other uses, including brightening faded car bumpers and reviving the gelcoat on your boat!

Polytrol now also comes in a handy 250ml spray can – great for quick application or for difficult to reach areas.

Learn more about Polytrol.

Dunne & Sorted
About Dunne & Sorted

Dunne & Sorted are based in Fareham, Hampshire and carry out window & door repairs. His work includes repairing handles, fixing draught problems, reviving faded surfaces, fitting cat flaps and more.

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31 thoughts on “How to revive a composite front door

  1. Advice requested: I’m feeling a bit gloomy as I’ve made a silly mistake in trying to clean some spots of alien paint from the inside of my front door. Some little bits were stubborn so I removed them with white spirit. An hour later, I realise the door now looks patchy where I did this. The surface of the door feels different as well – it is clear that I’ve managed to remove the surface by with the white spirit. Is there a way to recover the situation? I believe the front door is a composite one, and it has a dark brown wood finish.

    Many thanks, Lewis

    1. Hi Lewis,

      You could try a sample pot of Polytrol to see if it will recover the surface of the door. We’d recommend trying it first in a small area to see if it will recover the surface.

      Please let me know if you need any further assistance,
      The Owatrol Team

  2. We have used Polytrol on our brown composite front door, which had faded in patches, caused by the sun, rain and dirt from passing traffic, it now looks like it did when we had it fitted. The company were prepared to fit a new one under warranty, but we realised that it would probably just happen again and we are really happy with it, especially now thanks to Polytrol.

  3. Hi

    I have used this product on my black composite door, but i still have faded patches within the grain. Can I do it again or will that make no difference now?

    1. Hi,

      Thank you for your query regarding the use of Polytrol.

      Your problem could be the result of a few things;

      1) The surface wasn’t completely clean prior to application (For the best possible result using Polytrol, the surface must be clean, dry and free of dirt, grease, grime and mildew. All waxes, polishes, silicone etc should be completely and thoroughly removed).
      2) The Polytrol may not have been left to work for long enough before being wiped off.
      3) If the surface has absorbed the Polytrol unevenly it can create matte and shiny patches. If this happens, you should then move surplus oil from the shiny areas to the matte areas, remembering to wipe off excess Polytrol with a clean lint free cloth before it becomes tacky.

      I hope this is of some help to you.
      If you still have any queries regarding the use of Polytrol, please call us on 01582 592707 and we will gladly assist you.

      All the best,
      The Owatrol Team

    1. Hi Mark,

      Thank you for your query.
      Unfortunately the way to remove flaking from composite doors is by sanding – However you must be careful as sometimes coatings on composite doors are what prevents moisture ingress.

      If you have any further questions, please don’t hesitate to ask.

      All the best,
      The Owatrol Team

  4. Hello

    Regarding the above query “I have used this product on my black composite door, but I still have faded patches within the grain. Can I do it again or will that make no difference now?”

    I have the same issue but you have only stated why this may have happened, so my question also is;

    Can I apply a second coating over the now very dry first coat?

    Best Regards


    1. Hi Paul,

      Thank you for your query.

      If the first application of Polytrol was not successful and the surface has remained dry and discoloured, then you can re-apply a further coating of Polytrol.
      Just remember that the surface must be clean, dry and free of dirt, grease, grime and mildew.
      All waxes, polishes, silicone etc should be completely and thoroughly removed as this will hinder the penetration of Polytrol.

      I hope this was helpful, please feel free to contact us at or 01582 585266 if you require any further assistance.

      All the best,
      The Owatrol Team

  5. Hi. I have a navy blue composite door but there have been red dots appearing all over it. I have tried cleaning it but they do not come off. The people that fitted the door have no idea what may have caused it. Would your product help in this case?

    1. Hi Jo,

      This is a hard one to answer as we have never heard of this happening before.
      If you wanted to try and see if Polytrol would work, we suggest purchasing a 100ml sample pot and giving it a go. You can find the product page here:
      Failing that, we can only recommend you speak with the people who fitted the door again and ask them to look into it further as there may be a manufacturing problem.

      I hope this answer was helpful and I hope this gets resolved for you.
      If you have any further queries please do not hesitate to ask.

      All the best,
      The Owatrol Team

    1. Hi Laura,

      Thank you for your query.

      Polytrol is perfectly suitable for use on a red composite door. As with all surfaces, we would recommend purchasing a sample size pot and testing it in a small area first.

      I hope this was helpful.

      All the best,
      The Owatrol Team

    1. Hello,

      So long as the door isn’t white and has been painted the same colour each time, then Polytrol will work just fine.
      If, however, there are other colours underneath the top layer, there is a chance this will come to the surface.
      We recommend purchasing a sample pot and testing in a small area just to be sure.

      All the best,
      The Owatrol Team

  6. I need your help please!
    Some years ago Anglia fitted a composite exterior composite door (red). I would like to restore its colour which at the moment looks faded and patchy. I have been advised to use a Primer and then painted it but I have read that Composite doors should not be painted.
    I really do not what to do and my painter and decorator does not know either.
    As I have said the paint has faded, the colour looks sad and the grain is showing white lines along the grain. Please advice and let me know where I can get the Polytrol colour restorer.
    Do I need another product to clean the door before the restorer is applied, how can I clean it before using the product. How often does the door needs to be restored?Many thanks for your advice and help.

    1. Hi Maria,

      Polytrol will be suitable for reviving the colour and shine of your composite door.
      Before application, you would need to clean the surface thoroughly with warm soapy water or Net-Trol (
      Then be sure to rinse thoroughly and allow to dry a minimum of 24 hours.

      Polytrol usually can last for 24 months+ before re-application is necessary. It depends on the sunlight, rain and pollution in which it is subjected to (i.e living near to the sea may mean an earlier re-application of Polytrol is necessary as it is subjected to a harsher environment).

      We have a product information sheet that goes into further detail which you can find here:

      I hope this was helpful and answers your questions – please feel free to contact us again should you require any further assistance.

      All the best,
      The Owatrol Team

  7. Hi I have just purchased a house with a black composite front door. The previous owners have painted it black but the paint job is terrible, it is patchy, flaking, has large brush marks and runs. Could I clean this up with wire wool and then use polytrol to restore it? Would the fine wire wool leave scratches that may spoil the appearance of the door?

    1. Hi Sharon,

      Thank you for your query.
      As you have suspected, using a wire brush will indeed leave scratch marks and Polytrol will not cover these. In fact they will probably accentuate them.

      What you could do is remove the paint that has been applied with Dilunett:
      Then, as long as the original colour is not too faded, you could use Polytrol to restore the colour:
      Both of these products are available in a 100ml sample pot – we would recommend purchasing these and testing them out in a small area first.

      Polytrol will restore the colour of the over coated paint, but unfortunately will not hide any brush marks, patchiness or any other blemishes present.

      I hope this was helpful – please feel free to contact us again should you require any further assistance.

      All the best,
      The Owatrol Team

  8. Hi, we moved to our present house 3 years ago. It has a navy blue composite door which is sadly showing a multitude of shades now due to the effect of the sun. Do you think Polytrol is a suitable product to revive the door?
    Many thanks,

  9. Hi
    I have a rosewood coloured composite door with a upvc frame. The frame remains in excellent condition but the door seem to have paid the price of south facing and is now looking in a sorry state. I purchased your Polytrol but realised with removing the flaking it would not do the job. This is a 4 panel door with a glazed portion at the top. On one of the lower panes I have managed to scrape off ,a fair amount with
    my ‘thumb nail’ . However this way would be impossible over the whole surface. I have searched the net and see there are others experiencing the same problem. I see that you suggested , maybe, sanding but this would surely have an impact on the coloured surface. It is known that these doors South Facing ( with no porch ) do have a problem with degrading. I moved into the property about 3 years ago and it has only come to light after the heatwave we in past months. I would certainly not recommend buying another composite door unless the company offered a 10 year warranty to cover this problem .any ideas ??

    1. Hi Tony,

      I’m afraid Polytrol will do nothing if the door is flaking its original coating off. Polytrol will only recover a faded surface in good condition. We usually recommend going back to where you originally purchased the door and speaking with them directly, however, from experience we understand that it is rare for this problem to be resolved in this way. Sadly it comes down to the poor quality of the doors.

      I hope this was of some help.

      All the best,
      The Owatrol team

  10. Thanks for reply . No luck with the door manufacturer . Composite doors that face due south should not be fitted at all unless there is a porch over. If anyone is thinking of purchasing these door should consider my experience …Buyers Beware . I’m sure the salesman will not inform you of sun scorch ‘blistering’ , I realise that last August’s heatwave was extreme but in future years we may have to expect it . This door was £700 which as a tradesman I fitted myself., so not a cheapy . Before I remove, i am going to reposition (to east facing) sand it and paint it before I discard it , altogether.

    1. I’m sorry to hear that Tony. Apologies that we could not be of more help.
      Best of luck for the future.

      All the best,
      The Owatrol Team

  11. I have a composite door which has yellow run marks running down the inside, the colour on the inside is white. I have tried everything to remove the marks including white spirits but nothing seems to work. Would Polytrol work for this?

    1. Hi Jeanette,

      I am afraid Polytrol would not work for this purpose as Polytrol is a colour restoring oil. You would most likely need to use a stripping product to remove them.

      All the best,
      The Owatrol Team

    1. Hi there Mitch,

      No, I am afraid Polytrol will not work on any type of white coloured surface.

      Apologies we could not be of more help.

      All the best,
      The Owatrol Team

  12. Hi I got a cement driveway down last year there was sealant put over cement my red composite door has residue on bottom from this there are white patches will Polytrol work on door

    1. Hi Terry,

      Polytrol re-wets and revives pigments on surfaces that have become faded due to weathering, pollution and UV rays, so if the pigments have been completely removed via a chemical of some sort it is unlikely to work as there are no pigments for the Polytrol to work with.
      You could always purchase a sample pot which is £5 for 100ml with free delivery and test it on a small area to see if it would work?

      All the best,
      The Owatrol Team

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