CD50

Features and Benefits
CD50 is a specially formulated timber preservative oil for interior and exterior use, that is designed to penetrate deeply into any species of timber, and give protection against decay, fungus, mould and termites, in addition to providing water repellency, and assisting with dimensional stability (keeping the timber straight).

CD50 will not crack, peel or flake and will assist the control of warping, cupping, and splitting, while enhancing the service life of the timber.

CD50 is manufactured in New Zealand for New Zealand conditions.

CD50 contains the ultra-violet stable, high efficacy fungicide Copper 8 Quinolinolate, which is suitable for use on wood that may have incidental contact with food.

Is CD50 Toxic?

As a liquid, CD50 is very low in toxicity. When applied to timber, CD50 has little or no toxicity to mammals and is suitable for use on wood that has incidental contact with food.

How to use CD50

In order for CD50 to function properly it is essential that it is able to diffuse deeply into the timber. Correspondingly, any situations that would inhibit this free diffusion such as retained moisture, or the presence of any surface sealant or barrier, must be avoided.

CD50 - with or without Colourtone added - is applied to the timber, and a second coat is applied a minimum of four weeks later. Further applications may be required after 2 - 6 years depending on the porosity of the timber, and the exposure to the weather.

Where UV exposure is extreme, e.g. coastal and fully exposed conditions, reapplication times may be reduced accordingly. Timber in extreme exposure will be under a great deal of stress and more frequent applications may be required to keep the timber in good condition.

How do I know if anything is on my timber?

Take a cup of cold water - go to a protected part of the house where there has been little weathering e.g. the south side or under the eaves - dip your fingers in the water - flick the water at the timber. If it soaks in, the timber is probably not treated with a surface coating. If the water beads, it probably has a surface treatment

Where to use CD50

CD50 can be used on any timbers including Cedar, Pine, Macrocarpa Douglas Fir weatherboards, shingles, front and garage doors, pergolas, decks and other structures.

CD50 will protect shingles from feathering, splitting, & mould discolouration.

CD50 will not delaminate plywood.

Some pine plywoods have a wax repellent coating. As long as the wax content is less than 2% and the timber has dried after being treated (i.e.: all the smell has gone and the moisture level is below 17%), then CD50 can be used on Ply and LOSP-treated timber.

If the top layer of the Ply is very thin, contact Churton Pacific before proceeding. DO NOT use CD50 on veneers.

CD50 is used to protect Decks and Outdoor Furniture constructed with Kwila and other hardwoods

Colourtoned CD50

Exterior timbers coated with Clear CD50 will silver with age. Specially formulated colourtones may be obtained to mix with clear CD50 to maintain the natural timber character and colour and retain the 'freshly oiled look'.

When selecting from the range of Colourtones allow for the timber colour to naturally lighten during the first three to eight months after application, as natural weathering and leaching occurs.

Retention of colour is more durable on rusticated, or band sawn timbers, and may be maximised by including the Colourtone in all applications of CD50.

If Colourtoned CD50 has faded over time a simple recoat will restore the original look of the protected timber.

Clear CD50

CD50 may be used as a clear coating on exterior timber surfaces as a water repellent preservative, however the coated timber surface will silver with age. To prevent this a wide range of specially formulated Colourtones is available to maintain and enhance the natural timber character and colour.

Treating timber with clear CD50 will give all the advantages above and will allow the timber to silver naturally where it is in direct sunlight.
Alternatively, by using Silvertone or Smokey Grey Colourtone, the timber will be silver from the time of application, and you will avoid the uneven effect of natural silvering. In time, the natural silvering will take over from the effects of the Colourtone.

CD50 on New Timber

It is recommended that one coat of CD50 be applied to all faces or the timber prior to fixing, and a second coat of CD50 be applied a minimum of four weeks after application of the first coat. CD50LOG is recommended for thicker timbers such as posts, beams and logs followed by subsequent coatings of CD50 in order to obtain adequate protection, as CD50 has a cumulative effect in the wood with each application. When CD50 is used on plywood or laminated timber, penetration beyond the glue line may be inhibited.

CD50 on Pre-Treated Timber

Timber Timbers pre-treated by other processes such as LOSP or water-repellent dips are often impregnated with invisible film-forming waxes and polymers, which inhibit the free diffusion of CD50. Please contact Churton Pacific for advice and details of extended performance CD50 designed for use in these situations.

Mould & Fungus

Clean looking timbers may be contaminated with mould spores, which are not readily identifiable with the naked eye. Use SARAClean prior to CD50 application to be sure all mould spores are killed. If timber in this condition is coated with CD50 it is possible that dark staining may occur. If such staining inadvertently appears, contact Churton Pacific Ltd or your local supplier for Way2Go stain remover.

Weather and Temperature

Cold temperatures (e.g. weather in the South Island of New Zealand) will affect the viscosity of CD50 and will tend to slow down the rate of diffusion. Storing containers in a warm place immediately prior to application will help alleviate this problem. Timbers to be coated with CD50 should be clean and dry, ideally with residual moisture content of no higher than 17%. Do not apply CD50 to exterior timbers if it is likely to rain within 6-8 hours of application.

Coverage

These figures represent typical averages for common cladding timbers such as Western Red Cedar, Pine, Douglas Fir and Macrocarpa.

New timber dressed	15 m²/litre
Old restored timber dressed	7-9 m²/litre
New timber rusticated or band sawn	7-9 m²/litre
Old restored timber rusticated or band sawn	4-7 m²/litre
Shingles and shakes	2-5 m²/litre

Application

Avoid contact with plants, shrubs, trees and waterways. Apply liberally with spray, brush, brush or roller while removing drips and sags as necessary. When using Colourtoned CD50 it is essential that the pail be stirred frequently. The more CD50 that is absorbed, the longer the treatment will last. Equipment may be cleaned with detergent and water, or Mineral Turpentine.

Maintenance

CD50 must be reapplied as frequently as necessary to retain the natural beauty and colour of the timber. Typically timber initially protected with two coats will require a third coat in three to five years, depending on the porosity of the timber, situation, and exposure to the weather.
Where UV exposure is extreme, e.g. coastal and fully exposed conditions, reapplication times may be reduced accordingly. Timber in extreme exposure will be under a great deal of stress and more frequent applications may be required to keep the timber in good condition.

How to use CD50 on joinery and glazing

The first application of CD50 can be factory dipped or sprayed onto frames and sashes prior to site delivery. Joinery coated this way will require further on-site applications to complete timber protection. If using wooden glazing beads we recommend either Bostik Seal n Flex, Sikaflex PRO 2HP, or 3M Scotchseal 5300, which will adhere directly to timber already protected with CD50. Any of these products will provide a flexible seal and adhesive cushion. If glazing with linseed oil putty or similar, 'stripe' the glazing rebate with one or two coats of Primer No. 7. When fully cured, glaze as normal.

Precautions

If the timber being coated is on a garage door and the glue holding the timber to the frame is either a rubber based adhesive, or you are uncertain; run a bead of glazing sealer along the back of the door where the timber meets the frame. This will ensure that the timbers will remain intact if the CD50 weakens the adhesive. CD50 will dissolve rubber based glues and adhesives, and will affect Butynol and rubber surfaces if not wiped off soon after contact is made. When CD50 is applied to wooden shingles, it does not normally affect the rubber underlay. Timber protected with CD50 can become stained if it is in constant contact with bituminous type materials.

CD50 Inside

Timber surfaces coated with CD50 may show splash or spilling marks if contacted by chemically staining products such as wine, cleaners, contaminated water, or strong chemicals. At risk areas include kitchens and bathrooms.

Where plasterboard, plaster, or any other absorbent material abuts timber with CD50 then 'stripe' the mating edges or surfaces of the timber with two coats of WetShield to prevent cross diffusion into the porous substrate.

Exterior painted or plastered surfaces situated below CD50 protected timbers may become stained by leachate from above. If this inadvertently occurs contact Churton Pacific Ltd or your local supplier for Way2Go stain remover.

For more details and full technical information, please read the CD50Liquid Art Technical Data Sheet before use