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High grade stripper for wood finishes, grade stamps & mill glaze

from 10 reviews
Prepdeck 1L packaging
  • Removes old finishes & stains
  • Reduces mill glaze and removes grade stamps
  • Cleans all types of weathered exterior wood
  • Economical and easy to use
  • For exterior use only

Prepdeck stripper/cleaner is a professional, high-grade product specially designed for the removing of old solid and semi-transparent stains, unsightly grade stamps and other finishes from wood.

It is essentially a three-in-one product. Its main purpose when undiluted, is as an effective way to prepare a wooden surface for further treatment. Prepdeck strips away existing finishes along with stains, marks, and grade stamps.

When diluted, Prepdeck can also reduce mill glaze on new wood and prepare the surface to accept a penetrative finish.

The product can also be diluted for use as a powerful wood cleaner with the ability to get rid of even difficult marks and stains.

Ideal uses for Prepdeck

  • Prepdeck Stripper/Cleaner may be used on soft or hardwoods and thermo (burnt) wood.
  • It is ideal for garden decks, fences, cladding, log homes and garden furniture.
  • Perfect for the removal of stains, finishes and wood grade stamps.
  • Great for getting rid of mill glaze easily, thus allowing the wood to get the best finish possible.

Recommendations for use

Please note – when using Prepdeck you must neutralise the surface immediately with Net-trol. This prevents a reaction with the new coating to be applied.


This Product is DeckMark & CladMark Certified.

Find out more

Always read the Prepdeck Product Information before using and follow the instructions carefully.

Surface Preparation

Remove any loose and flaking finish.
Brush off any physical surface contamination i.e. moss, general dirt etc.

Application Tools

  • Synthetic brush
  • Roller with synthetic cover
  • Garden Spray
  • Synthetic scrubbing brush


To strip old finishes and grade stamps

Use undiluted.

To reduce mill glaze

Add 1 part Prepdeck to 4 parts water – except for Ipe; then add 1 part Prepdeck to 1 part water.

To clean

Dilute 1 part Prepdeck to 5 parts water up to a maximum of 1 part Prepdeck to 20 parts water, depending on condition of the surface.


Shake or stir product well before and during use including diluted solutions.
Use Prepdeck as is or dilute according to “Dilutions” above. Keep surface wet with Prepdeck while it is working.
After rinsing ALWAYS neutralise surface with Net-trol except where Tropitech is the chosen finish (see “After stripping/cleaning”). Do not use a wire brush to scrub the surface.
Work large areas in zones.
Allow wood to dry thoroughly, 2-3 days before refinishing.

Stripping and Cleaning

Work in areas that can be completed in 15-30 minutes.
Apply Prepdeck to the area to be stripped or cleaned and allow to work.
After an appropriate time, test a small area with nylon scrubbing brush to see if finish or dirt is lifting.
If lifting, scrub area with a stiff nylon brush, deck brush or use a Power Washer at 1000-1500 psi (70-103 bars) depending on type of wood.
Always work in direction of grain.
Rinse with copious amounts of freshwater, using the highest pressure from the water source available or use a Power Washer at 500-1000 psi (35-70 bars) working in direction of grain. (Rinse adjacent areas at same time).
NB: The use of hot water makes the job easier.

Reducing Mill Glaze

Apply Prepdeck to the area to be treated.
Allow to work 20 minutes.
Scrub area with a stiff nylon brush, deck brush or use a Power Washer at 1000-1500 psi (70-103 bars) depending on type of wood.
Always work in direction of grain.
Rinse with copious amounts of fresh water, using the highest pressure from the water source available or use a power washer at 500-1000 psi (35-70 bars) working in direction of grain (Rinse adjacent areas at same time).

Removing Grade Stamps.

Apply Prepdeck undiluted and scrub until stamp is gone. Rinse thoroughly.

After Stripping / Cleaning

Always neutralise the surface with Net-trol except where Tropitech is the chosen finish.
If Tropitech is the chosen finish, lighten wood with a 1 part bleach to 3 parts water solution.


Prepdeck will not remove the following types of coatings 2 pack or baked on paints:
Polyurethane paint and varnish.
Do not use on aluminium.

Clean up

All that is required for clean up is water.

Things to remember

Always carry out a preliminary test prior to commencing the job, to determine the contact time necessary for stripping or cleaning the wood.
Wear chemical resistant gloves, safety goggles and protective clothing.
Hardwoods including exotic hardwoods and woods rich in tannins such as Cedar, Oak, Teak, Ipe etc may darken with Prepdeck.
Where Prepdeck has darkened the wood DO NOT allow it to dry, prior to using Net-Trol or a 1 part bleach to 3 parts water solution (see “After stripping/cleaning”).
Cover and protect everything you do not wish to strip or clean, including plants, shrubs and any aluminium surfaces.
When stripping vertical surfaces, work from bottom to top to avoid streaking.
Apply between 5°C and 35°C.
Do not apply in direct sunlight or on a hot surface.
Do not allow Prepdeck to dry on the surface. If drying occurs dampen with a mist application of water.

10 reviews for Prepdeck

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  1. Avatar


    Hi I’m looking at this product to get years of paint and oils off my decking do u having to pressure wash it off as I wouldn’t be able to do that where the decking is situated ?

    • Owatrol Team

      Owatrol Team

      Hi there Kate,

      Ideally you would have a pressure washer but a garden hose will also suffice. Prepdeck requires the use of water to remove it from the wood: https://www.owatroldirect.co.uk/wp-content/uploads/2022/04/ften_prepdeck__054383200_1148_18092014.pdf

      Once Prepdeck is ready to be removed, you would need to scrub surface with a stiff nylon brush, flushing with copious amounts of water at the same time or by using a pressure washer at 725-1500 psi (50-103 bars) depending on the type of wood.

      Once removed, rinse thoroughly with lots of fresh clean water, using the highest pressure from the water source available or via the use a pressure washer at 500-1000 psi (35-70 bars).

      After the wood has been thoroughly rinsed, you must immediately neutralise the surface with Net-Trol – this is to stop the active ingredient in Prepdeck from continuing to work.

      I hope this was helpful, please feel free to call us on: 01582 592707 or email us at: sales@owatroluk.com for further assistance.

      All the best,
      The Owatrol Team

  2. Avatar

    Geoff Westmoreland Verified Owner

    I have a three year old very large deck up in Aberdeenshire, and stupidly applied a very expensive decking oil (it had good reviews). However, the low average temperatures up here and the frequent rain made it almost impossible to apply in accordance with the instructions, it lasted a year before peeling in parts and wearing away in areas of moderate foot traffic. I tried again the following year with even less success. This year I came to my senses and decided to go for something like creosote that soaks into the wood and doesn’t form a skin that will peel or flake. But, I couldn’t find a decking stripper that actually worked until I discovered Prepdeck (I’ve tried the others available in the UK – all a waste of time and money!) Prepdeck is simple to use and very very effective. After some experimenting I found the I removed almost 100% of the previous oil layers in one pass by lightly wetting the Prepdeck after it has been sitting about 15 minutes, and waiting for another 15 before using the pressure washer. Excellent product. Don’t waste your money on the other rubbish.

  3. Avatar

    Amanda Nash

    I was not looking forward to this job. 25 square metres of softwood deck with 3 years of Ronseal Ultimate Decking oil on it, which had peeled in places as it’s not oil and sits on the surface. Got to work using Prepdeck and followed the instructions for the touch time. Armed with a pressure washer and a deck brush, the whole deck was done in 5.5 hrs. I was totally impressed with Prepdeck – stripping the coatings back was a simple brush up the plank after about 15 minutes followed by rinsing it all off with the pressure washer. The recommendation to work in small areas pays off – I was doing 2-3 square metres at a time and quickly got into a good routine. I followed this up with Netrol to neutralise. I now have what looks like how my deck looked when it was installed. It actually looks like it’s just been fitted. I intend to sand, then follow up with Textrol next weekend (weather permitting). All I can say is a massive thank-you from me. You get what you pay for – don’t waste your time elsewhere and buy the product that will actually do the job.

  4. Avatar

    Diane Verified Owner

    Excellent product, easy to use but very expensive

  5. Avatar

    Dave Lupton Verified Owner

    I can definitely recommend this product for removing 5 or 6 years worth of Ronseal decking oil which had hardened and darkened the decking. I applied with a brush, scrubbed a little and the pressure washed off. It removed just about all the old decking oil. Application of the Netrol then brightened the wood to leave the decking in virtually new condition. I would recommend buying the sample first to check it will remove the coating you have on your own decking as it is expensive. I tried a sample of Aquanett also, which was effective but the Prepdeck was better.

  6. Avatar

    Gary Brown Verified Owner

    I used this after 4 to 5 years of just cleaning. Decided to use it neat to get rid of previous coatings. Worked a treat just follow the instructions, followed with netrol and decking is like new, no sanding required even on the worst areas.

  7. Avatar

    Josie Phillips Verified Owner

    I was not looking forward to this job, with hazardous chemicals and warnings! My deck had been left mottled with a very expensive, but useless high street decking paint and bare bits!
    My deck is quite large and granted it was a long job, but it was nowhere near as awful as I anticipated. Followed up with the Net-trol I am sitting back and looking at an excellent job.
    I can still see darker areas, but I didn’t expect it to look like new wood.
    I am not wrestling with the next decision. Opaque Decking Paint? or Solid Colour Stain?, and in what colour?. I thought the decking had had its day.
    Thanks Owatrol

  8. Avatar

    Ged Verified Owner

    Not satisfied with this product for the price, cheaper alternatives available that can achieve the same results. I have ended up using a hand sander on 25m2 deck 🙁
    I will be trying the Net-Tol at the weekend then Textrol, lets hopes these live up the reviews.

    • Owatrol Team

      Owatrol Team

      Hi Ged,
      We’re sorry that you aren’t happy with your experiences with Prepdeck. Are you able to give us any more information about your application process?
      Many thanks,
      The Owatrol Team

  9. Avatar

    Ryan Wilson

    I really cannot rate this product highly enough. I had 5 years of oils, dirt and a sub surface black fungus growth. This product took everything out on the first attempt. Had to use it neat and keep it moist for 15 mins but what a job it did. U get what u pay for. And all on a hardwood balau deck.

  10. Avatar

    shicks Verified Owner

    This product was very good for getting the old paint off our decking, although some stubborn areas did retain the original paint, but generally it was very good. Please red the instructions and protect your skin, I didn’t and wished I had!

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Coverage: Dependent on dilution (see Product Information Sheet)
Tools: Synthetic Brush/scrubbing brush, Roller with synthetic cover, garden Sprayer
Suitable for: Exterior use
Clean up: Water
Working Time: Dependent on finish to be stripped
Suitable Surfaces: All exterior wood