Understanding Colourtones

How Long Does CD50 Last

People always want to know - how long will the CD50 products last? Well, they are inside the timber forever! Deep within the timber, the CD50 is helping keep the timber straight and helping protect against mould, fungus and rot. What most people are interested in is – how long does the colour last?

Unlike the film forming products, CD50 can never peel or flake, but will fade gradually over time.

How long this takes mainly depends on 2 things
-          how much oil and colour the timber has absorbed
-          and the amount of exposure to sunlight or UV rays.

More porous timber, bandsawn or rough timber absorb more oil and colour, so the colour will last longer than smooth timber or very dense hardwoods. There is less surface area to absorb the oil & colour with hardwoods and very smooth timber. Mill Glaze can also be an issue – see below.

Vertical Cladding

If the timber is hammered by the sun, is north facing, or gets double UV from reflection of water or white concrete, the colour will fade sooner. In these cases, it is important to remember that the timber will be under considerable stress and more frequent applications will be necessary both to replenish the colour, and also to nourish the timber.

So for vertical timber – as in the side of a house – the length of time before maintenance is required could be 3 to 6 years, even longer in sheltered situations. Very smooth timber and hardwoods may need recoating more frequently – at least until the fibres open up and allow more absorption of the colour.


On decks, the timber lies horizontal to the sun, and for some reason they are usually built in the sunniest position possible, so UV exposure is very high. In addition, hardwoods are often used. So maintenance for decks is more frequent

There are 3 options for decks

1.       Apply CD50 Extreme Clear and let it silver naturally

2.       Apply CD50 Extreme with a Colourtone – preferably a colour that works with the timber – wash and reapply annually

3.       Apply CD50 Extreme Clear – if silvering is not the desired look, then clean off the silvered fibres with DeepClean when it appears, revealing the underlying timber. Reapply CD50 Extreme every 3 years to top up the level deep in the timber

We have special Colourtones available – the BB Colourtones  - which contain 1 and a half times the usual amount of colour. These can be used when more colour retention is needed – for example hardwood decks, or if colour fading is an issue due to high UV exposure. Some colours can even be doubled or tripled – but check with Churton Pacific if your colour is suitable for this.

Note – all CD50 products are compatible with each other and all the Colourtones.

Sometimes CD50 Extreme will “suck in” a lot of the Colour with it, on particularly absorbent surfaces. If this occurs on the first application, do samples before the second application to see if a more intense colour is required for the second application (BB colour or double/triple)

Mill Glaze - How to increase colour build on new wood

New timber is milled smooth and often has a mill glaze which will greatly restrict the initial colour build. Better results can be achieved by creating a rougher surface and preparing the timber using CD50 DEEPClean in combination with a high pressure washer. Sanding the new timber with 80 grit will give even better results as it removes mill glaze and creates a much rougher surface which will enable higher colour build. Note…The rougher the surface of the timber, the greater the colour build and durability. Rough sawn or heavy brushed timber profiles will take more oil and colour so much bolder colour contrast can be achieved. The amount of mill glaze if any that is present on any job can vary significantly depending on species density, and machining method used. Note, sanded surfaces should be vacuumed or washed thoroughly to remove all loose timber and dust.