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CD50X Extreme Timber Protection Oil Clear - 4L

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CD50 Extreme is the timber protection of choice when it comes to the most extreme situations.

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Product overview

Product overview

CD50 Extreme is the timber protection of choice when it comes to the most extreme situations. From locations in harsh environments (coastal, high humidity, dampness), to building products that are pretty extreme themselves (logs, thick posts or beams). Because CD50 penetrates deep into timber, it can get in to protect the thickest of timbers. CD50 Extreme is specifically formulated for just these jobs.

If you want to minimise warping, cupping, checking and splitting, and help control mould and fungus - reach for CD50 Extreme. It will add years of life to your timber and means less time and money spent maintaining your timber.

• Does not form a film, preventing peeling and flaking while making maintenance easy
• Controls and prevents the growth of mould, fungus and rot
• Enhances grain and character of timber
• Product of choice for decking, thick timbers and timber in extreme conditions
• Easy maintenance, just wash & re-apply with no sanding
• Perfect for humid or damp conditions

These figures represent typical averages for common cladding timbers: Cedar, Pine,
Douglas Fir, Macrocarpa etc:

• New dressed timber: 12-15 m² per litre
• New rusticated or bandsawn timber: 7-9 m² per litre
• Old restored dressed timber: 7-9 m² per litre
• Old restored rusticated or bandsawn timber: 4-7 m² per litre
• Shingles and shakes: 2-5 m² per litre
• Hardwoods: 12-15 m² per litre

Colour: Clear
Size: 4L
Weight: 4kg

View technical data sheet

View information sheet

Can we help?

Our friendly and knowledgeable gurus are trained to answer all your questions as quickly as possible. So if there’s anything you need to know just give us a call during business hours, or send us an email any time.

0800 800 880
Customer questions

Questions and answers

1 vote
q: Is cdx50 suitable to seal and coat a bare macrocapa bar leaner to be based outside.
a: Yes it will be great.
By Trade Tested on October 5, 2020
1 vote
q: Can i seal back of weather boards andframing in old cottage?
a: Yes you can.
By Trade Tested on August 19, 2020
0 votes
q: Does a deck become slipprey when wet?
a: No it won't.
By Trade Tested on November 15, 2020
1 vote
q: We have built a sleep out using pine ply on the outside. Can I use this product on the outside walls for protection as well as looking good?
a: Yes you can.
By Trade Tested on June 9, 2020
1 vote
q: Can we apply on already stained deck?
a: No as the product needs to soak into the wood to work.
By Trade Tested on May 25, 2020
0 votes
q: Can this product be used as a timber preservative on decking timber. Wanting to treat cut ends of pine decking and joists?
a: Yes it can - however the pine decking should be H3.2 so no need to treat the ends after cutting.
By Trade Tested on June 9, 2020
0 votes
q: Is this product suitable for Vitex? Some reviews used it on Vitex and said great and then in one of the Q and A’s you said it is not suitable as Vitex is too hard to penetrate
a: Apologies we got it wrong - this is fine on Vitex.
By Trade Tested on June 9, 2020
0 votes
q: Can this be applied to exterior redwood Sleepers (200x50).
a: Yes it can.
By Trade Tested on May 29, 2020
0 votes
q: Will it protect cedar being used for a raised vegetable garden?
a: Yes it will.
By Trade Tested on June 9, 2020
0 votes
q: Ive a new pine deck at a coastal location. I want a weather grey driftwood look rather than a brown. Will the deck weather a grey colour after use of your clear oil? Or will it stay a brown colour if i oil it now? Or do i wait for it to weather then oil it?
a: The clear CD50X will weather to grey, you can view heaps of additional info using the download links at the end of the product description.
By Trade Tested on May 19, 2020
0 votes
q: What is the best way to apply it to a new deck ?
a: Best thing to do is download the links at the bottom of the product description that outline this and more,
By Trade Tested on May 11, 2020
0 votes
q: Hi, I have a driftwood sculpture that is out side, I would like to try and protect it with a stain, would this product work ok ?
a: Yes it will however be aware it will change the colour.
By Trade Tested on May 11, 2020
-1 votes
q: Can I use your CD50 Extreme as a 2nd layer if I used Clear Metalex as the first layer?
a: The idea of the CD50 is that it is absorbed into the wood, so it wouldn't be effective.
By Trade Tested on April 15, 2020
0 votes
q: Can I use this product to apply on an outdoor deck and boardwalk that is made of pine?. It was installed over 6 weeks ago.
a: Yes you can.
By Trade Tested on March 30, 2020
-1 votes
q: I have one of those fences where the boards weathered to that gray look. I don't like that. Can I water blast the wood (carefully) and then apply CD50X? Thank you
a: Yes this will work well.
By Trade Tested on March 30, 2020
0 votes
q: Hi We are currently building a new house in Twizel where the temperatures are extreme hot and cold. We are using vitex decking to build our decks and want to use a clear stain to protect the deck. Is this product suitable?
a: Yes this will be good.
By Trade Tested on March 11, 2020
0 votes
q: Hi, I have Rimu (120 year old) floorboards finished with OSMO. Can I recoat with your product or do I need to sand first and is CD50X suitable for indoor flooring?
a: We wouldn't recommend this product for this type of job, the focus is on protection outdoors rather than finish specifically. We would suggest consulting and expert in this area.
By Trade Tested on November 20, 2019
0 votes
q: Will this stain go over the top of a water based decking stain?
a: No it won't. The CD50 products work by penetrating deep into the timber, therefore, before application ensure there are no sealants, barriers or any other products that could affect the penetration of CD50 Extreme.
By Trade Tested on October 18, 2019
0 votes
q: Is this product suitablbe for hardwood ie Kwila on decking ?
a: Yes it is, if you give our sales team a call or email they'll be happy to send you some info.
By Trade Tested on October 7, 2019
0 votes
q: How long does this finish last - ie does it need to be reapplied annually?
a: According to the manufacturer reapplication time can be from 2 to 6 years – this depends on timber type, and exposure to weather and sunlight. If you'd like more guidelines on use or application feel free to give our sales team a call or email.
By Trade Tested on September 30, 2019
Customer reviews

Customer reviews

Overall rating

5 out of 5 stars from 13 reviews
Bob Jenkins Kaitaia

Best treatment for exterior timber

6 days ago


Great product, best thing for wooden decks. No cracking or peeling, just was and declare, or let it silver off knowing that the timber is protected under the surface.

Sounds Captain Marlborough sounds

J. Fisher

about 1 month ago


I found the product way better than other brands I've tried. Its easy to apply it doesn’t try and alter the colour, easy clean-up, and if it does what they say. It will protect my expensive deck and make it last much longer.

Bay leaf St Heliers

Worth the effort

about 1 month ago


Recommended by our timber hot tub provider and had brought the tub back to tidy and was easy to use.

Cinna Southland

Great product!

3 months ago


This oil brought my sun-bleached decking up to a beautiful standard, l used a lot more than l thought l would have. 12 litres on a 2.6 x 24 mtr deck, however it was well soaked in and the rain did not penetrate it at all. The deck looks better than when it was first put down. I used a sheep skin deck mop and very pleased with the fantastic results.

Carl Motion Putaruru

CD50X Extreme clear oil

3 months ago


Great product, the clear oil gives the redwood a perfect wet look that shows up more of the natural grains and colour.

Gary Wellington


9 months ago


I used this product on an unpainted macrocarpa outside building that had been left to weather for several years and this product was amazing very easy to apply and looks like new. I only applied one coat.

Dave Cable Bay Northland


10 months ago


Good product for my coastal environment.

Gaza Te Horo


10 months ago


Great product very easy to apply and made our frontage which was old marcrocarper look like new

Wendlewulf Waikato

Goes down well

10 months ago


A bit pongey and needs a well ventilated environment but gives a good finish.

Edi Reikorangi

An absolute must to treat your wood/deck and more

about 1 year ago


Excellent product, easy to deal with, very good coverage, i used it on my various wooden decks and fencing, tried on wooden furniture too with stunning results. In addition TradeTested provided swift order processing and delivery. Highly recommendable product and supplier.

BrianW Auckland

Vitex Deck

about 1 year ago


I built my deck from Vitex 3 years ago but then finished it with with an acrylic decking “oil” which turned out be completely the wrong thing to do. The product didn’t wear well at all and within 6 months it looked terrible, so I decided to sand it back completely and start again. This time I did my research and went with CD50X. What a difference! Now the deck looks stunning and can stand moving furniture around without scrape marks and scratches, I am so pleased, should have done this in the first place.

Cozza Auckland


about 1 year ago


Excellent product - great looking on Vitex and easy to apply. Water on the surface of the deck indicates excellent protection from water penetration.

Kam Auckland

CD50X Extreme Timber Protection Oil- 4L

over 3 years ago


Best product you ever buy.

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