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Cutek Extreme is a high performance stabilising coating for all types of wood, and is also suitable for use with bamboo products, both laminated and strandwoven. Bamboo products which still have a hard skin, such as poles, cannot absorb Cutek oils through the skin.

Surface preparation is critical!

In order for Cutek Extreme to function properly, it is essential that it is able to diffuse deeply into the timber or bamboo. Any situations that would inhibit this free diffusion such as retained moisture, insufficient time between coats, or the presence of any surface sealant, old coatings or other barriers, must be avoided or satisfactorily remedied prior to using Cutek Extreme.

Preparation may involve thorough sanding or stripping to completely remove the previous coating. If stripping is required, we recommend the use of Cutek CD33 Naked. Once all the previous coating has been removed,the surface should be cleaned with Cutek Pro-clean. Cleaned bamboo or timbers to be coated with Cutek Extreme should be absolutely dry before application.

Material treatment

New timber, Bamboo and Plywood

Ensure that timber or bamboo to be coated is clean and dry. The glue in plywood or laminated timber may inhibit diffusion of the oil. Cutek Extreme can be used on CCA and other treated timber, however timber pre-treated with wax and polymer processes such as LOSP may require cleaning first with Cutek Proclean.

Old, or Previously Coated Timber, Bamboo and Plywood

  • Old, dirty, stained or weathered timber or bamboo should be prepared by first applying Cutek Pro-clean restoration agent, then power rinsed with a high pressure washer set to under 750 p.s.i. (50 bar), with a fan jet pattern to avoid damage to the wood fiber.
  • Once the timber or bamboo is thoroughly dry, apply two coats of Cutek Extreme (see application procedure below).
  • High-pressure water alone will not eliminate biological growth from timber or bamboo and may damage the wood fiber. Avoid the use of sodium hypochlorite bleaches which harm the environment and may damage the timber.
  • Wood previously coated with stains, linseed oil, paint, polyurethane, etc., must first be restored with a paint stripper such as Cutek CD33 Naked and/or Cutek Proclean prior to the application of Cutek Extreme.

Application Technique

    Before application

    • Avoid contact with plants, shrubs, trees and waterways.
    • Ensure the timber or bamboo to be coated is dry—with a moisture content of no more than 17%.
    • If using a colour tone, add the tin of colour tone to the tin of Cutek Extreme and stir well. It is essential that the mixed Cutek Extreme be stirred frequently before and during use.

    Applying Cutek

    • For best results one coat of Cutek Extreme should be applied to all faces of the bamboo or timber prior to construction, with a second coat of Cutek Extreme applied once construction is complete.
    • Any second coat should only be applied once the first coat has completely penetrated and is dry. The time taken for Cutek Extreme todiffuse into the timber or bamboo varies significantly, depending on aspect, species, ambient temperature, porosity and moisture content of the timber or bamboo.
    • Thicker timbers such as posts, beams and logs will require additional coats of Cutek Extreme in order to obtain adequate protection, as Cutek Extreme has a cumulative effect in the wood or bamboo with each application.
    • Apply liberally to absorbent timbers or bamboo with brush, paint-pad, fabric mop, lambswool applicator or roller while removing drips and sags as necessary. Apply more sparingly to dense timbers—three thin coats on dense hardwoods and bamboo are better than two heavy coats. The more Cutek Extreme product absorbed, the longer the coating will last.

    After application

    • Cutek Extreme does not leave lap marks, and areas that have not dried after three days should be left longer to dry, or wiped dry, before re-coating or allowing foot traffic on the deck.
    • Equipment may be cleaned with detergent and water, or mineral turpentine.
    • Drying only occurs after full diffusion into the timber or bamboo, and will be significantly slower during winter or cold ambient temperatures.
    • A second coat should be applied when the first coat is dry, which may be up to 72 hours or even longer depending on weather conditions. If the first coat took more than 72 hours to dry, apply a thinner coat the second time.


These figures represent typical averages for common decking and cladding timbers such as Western Red Cedar, Pine, Spotted Gum, Jarrah, Ironbark, Ipe, Tiger deck, Cumaru and other Exotics, Thermal wood etc.

New hardwoods dressed 10–15m2/litre (400–800sq feet/gallon)
Old restored timber dressed
7–9m2/litre (300–400sq feet/gallon)
New timber rough sawn 7–9m2/litre (300–400sq feet/gallon)
Old restored timber rough sawn
4–7m2/litre (180–300sq feet/gallon)
Shingles and shakes
2–5m2/litre (84–212sq feet/gallon)