Ronseal Ultimate Protection Decking Oil 5L

  4.9/5.0   489 reviews
You'll need enter area above for 2 coats (Recommended)

Wood type and application can vary coverage

  • A tinted, water-based decking oil suitable for bare, pressure treated or preserved decking
  • Perfect for all smooth and grooved, softwood and hardwood decking
  • Offers up to twice the resistance as standard decking oils
  • Excellent water repellency, rainproof in just 90 minutes
  • Penetrates deep into the wood to provide a long lasting finish
  • Replaces natural oils lost through weathering
  • Nourishes the timber to help prevent cracking, splitting and warping
  • Available in a range of natural wood tone colours
  • Low V.O.C
Brand Ronseal
No. of coats 2
Coverage Up to 9 per litre
Drying time 24 hrs
Size 5L
MPN 38524, 38526, 38525, 37300, 38528, 38527
GTIN 5010214872978, 5010214872992, 5010214872985, 5010214873005, 5010214872954, 5010214872961

In order to satisfy all orders you may receive a different style tin to the one displayed (one includes a banner "4L + 25% FREE", the other looks like a standard tin. Rest assured, they are the same product, and the price shown is the promotional price (4L + 25% FREE).

Ronseal Ultimate Protection Decking Oil will leave decking protected and looking great for longer with a natural or tinted colour finish.

  • Have grooved decking? You'll normally need double the quantity. Our handy coverage calculator will help you choose the right amount

Decked areas to be treated should be clean, dry and free from traces of dust, dirt, oil, grease, wax and silicone.

New Decking Preparation

For all bare wood decking including tantalised, pressure treated and preservative impregnated decking timbers.

New softwood decking

  1. Treat with Clear Ronseal Total Wood Preservative (as this is wax-free) for the best protection. (The coloured versions contain wax which will cause adhesion problems)
  2. If possible, preserve all sides including end grain prior to installation
  3. Sweep the decking with a stiff broom to remove all traces of surface dirt and debris
  4. Use a suitable decking cleaner if required before oiling

New hardwood decking

Hardwood decking usually requires a period of weathering to allow the surface grain to open up. This allows for better absorption of the decking oil. Check the decking manufacturer's guidance on how long decking should be left to weather before treating.

Old Decking Preparation

Old coating type finishes such as decking paints, varnishes and varnish type stains must be fully removed back to bare wood before oiling. Depending on the condition and type of finish, it may require more than one attempt to fully remove the old coating.

  1. Ensure that all 'coating' type finishes have been fully removed to expose bare wood by either jet washing or using a dedicated decking stripper and remover
  2. Clean old decking oil finishes thoroughly with Ronseal High Performance Decking Cleaner Sachets
  3. For decking affected by mould, algae or moss, or to restore the colour of decking that has turned grey or silver over time, use a decking restorer or reviver gel
  4. For the best protection, treat with a suitable exterior wood preservative
  5. If possible, preserve all sides including end grain prior to installation
  6. Sweep the decking with a stiff broom to remove all traces of surface dirt and debris before oiling

Always do a small test area before starting any project and follow the manufacturer's instructions on the tin at all times. Do not apply in damp conditions, when rain is likely, or when are temperatures below 10℃.

  1. Shake the tin thoroughly before pouring the entire contents into a suitable metal or plastic container; if using more than one tin mix them together (Do not thin or dilute)
  2. Apply liberally to ensure that even penetration and complete coverage of the decking is achieved
  3. Treat 3-4 decking boards at a time to avoid overlap marks
  4. Redistribute any excess oil along the decking boards or wipe off with a clean cloth
  5. Allow 4 hours drying time between coats
  6. Apply an even second coat as above

Regular Cleaning

To preserve the oiled finish for longer, we recommend that wooden decking is swept with a stiff broom on a regular basis to remove loose leaves, dirt and other organic matter. This prevents a build up of organic matter that can settle on the deck and in the grooves, which can degrade and damage the finish and decking timbers over time.

Deep Cleaning

For deep cleaning, use Ronseal Decking & Garden Cleaner.


Inspect the finish on an annual basis and apply a fresh coat of oil as and when required.


Stubborn marks and stains may require a light sanding before re-applying a thin coat of Ronseal Ultimate Protection Decking Oil to the affected area.

489 customer reviews
Goes on easily and finish is beautiful after 2 coats by Margaret Walker

I bought this product on the advice of my decking supplier/fitter. Waited the required time before treating. After following the instructions the result is excellent. The depth of colour is very attractive too. I have already bought next year's treatment. Couldn't resist the offer.

Reviewed Natural Oak on: 11/09/17
Excellent by Anna Marshall

This was easy and quick to apply and turned out a lovely natural colour

Reviewed Natural Pine on: 11/09/17
Very good and easy to use by Maria Lenton

Very good and very pleased with result

Reviewed Natural on: 10/09/17
Does what it says on the tin!! by Mrs Irene Barratt

This product does exactly what it says on the tin. Our decorator commented that it was a very good quality product which applied very easily. The finish is fantastic.

Reviewed Natural Oak on: 10/09/17
Fantastic! by Chocolatelab

Very easy to apply, definitely need two coats. Have used various products over the years but this is looking the best so far. Just need to see how it performs over the winter.

Reviewed Natural on: 10/09/17
Fantastic by Mr Joseph Bill

This Ronseal oil is excellent and looks amazing after you have put on the second cost. It is far better than the stain in my option, looks more natural. Very happy with it indeed

Reviewed Natural Pine on: 06/09/17
Good Product at a good price by Mrs D A Cronin

After looking around for this product at local DIY stores, we could not find at a comparable price, ordered and delivered swiftly with no fuss, Will order again whenI need to

Reviewed Natural Oak on: 06/09/17

Quality product at great price

Reviewed Natural Oak on: 06/09/17

easy to apply does the job well

Reviewed Teak on: 05/09/17

yes, makes the decking watertight, love the way little balls of rain remaining sitting on the edcking after a shower

Reviewed Natural on: 04/09/17
Easy to apply,needs a few coats to achieve perfect colour by Huw Thomas

I treated the decking boards with water proofing treatment a few days beforehand and let it dry then I applied 3 coats of oil over a period of 10 days but because the weather was not suitable the final coat needed a few brush strokes to get the oil to cover properly, probably because it was 5 days after the second coat had been applied and it was too dry. I used Natural Cedar but after 3 coats the finished colour is still not what we envisioned it would be like.

Reviewed Natural Cedar on: 03/09/17
First time used this product, easy to apply by Mr Robert Tole

Quality decking oil, new decking needed just 2 coats. Still looks as good as when it was applied 2 months ago

Reviewed Natural on: 03/09/17
Great product by R K Dale

Did my decking rail and it rained 3 days later, it was good to see the rain beading on the surface.

Reviewed Natural on: 02/09/17

very good

Reviewed Dark Oak on: 30/08/17
Excellent Decking Oil by Mr J Graney

Great price

Reviewed Natural on: 29/08/17
Easy to apply and does the job by David Moir

Ronseal ultimate is very easy to apply, dries fairly quickly and looks great. Also has a nonslip finish, very important in a wet climate

Reviewed Natural Oak on: 28/08/17
Great product by Mrs Janette Utley

Used this on our new soft wood decking easy to use fast drying as colour exactly as expected

Reviewed Natural Oak on: 28/08/17
Great sealing oil for the decking and easily applied by H Morrison

Does what it says on the tin. I prefer to use a brush to apply attached to a extending pole found all other ways not as good for application.

Reviewed Teak on: 28/08/17
Perfect perfect perfect by Bob Wilmot

Dose more than it says on the tin.

Reviewed Natural Cedar on: 27/08/17

Easy to use and drys to a good finish would buy again

Reviewed Natural on: 26/08/17