Special Finishes

Architectural and Decorative Coating Specialists

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Deckote System

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Weatherproofing for Plywood Deck


Ensure all plywood is marine type or exterior grade, fix in accordance to MFC instructions.  use of Bondit adhesive glue and stainless crews counter sunk is highly recommended.  Grind taper on all joints (remove all dust).

Sealer Coats:

  1. Apply 1 coat of Multiseal Urethane sealer Dilute 50% with White Spirits.  Allow 2 - 4 hours to dry
  2. Apply 1 Coat of Multiseal Urethane Sealer dilute 20% with White Spirits.  Allow 2 - 4 hours to dry.
  3. Apply 1 coat of Deckseal JC50 to all joints.  Allow to dry.
  4. Apply (using Blacktex roller) 2 thick coats of CTEM Deckcoat @ 2 m² per litre coverage.  Allow 1-2 hours to dry between coats.  (Provides 600 microns DFT).  allow to dry.
  5. Cut mesh to correct size - lay down on dry membrane and bush on CTEM Deckcoat - working it through Mesh.  Maintain even finish brushing out any entrapped air pockets, overlap each layer of mesh by 50mm.  allow 1 -2  hours to dry.
  6. apply (using Blacktex roller) 3 - 4 further thick coats @ 2m² per litre per coat of CTEM Deckcoat.  A total minimum dry film thickness of 1200 microns should be achieved.  Allow to dry between coats.  if a smoother top finish coat is required, dilute TOP COAT ONLY with 10 - 15% water.  clean up with water.  Blacktex stipple roller provides a slight subtle texture that may also assist with Anti skid properties.


CTEM Deckcoat should definitely not be used under tiled flooring and in temperatures below 15°C and should only be applied in hot summer months.  It is not recommended in cold winter as through dry is considerably inhibited.  if application temperatures are below 20°C then apply more coats at thinner film builds to allow complete drying between coats and should only be used if the total recommended film thickness is between 1.2 mm to 1.5 mm is achieved.


Apply at the minimum rate of 2.5 litres per m² per coat over five coats.  This should provide approximately 1500 microns dry film thickness.  Clean up before dry using water.

Contact Special Finishes Ltd before application on any unfamiliar substrates.


Warranty / Liability

Special Finishes (NZ) Ltd provides all the enclosed information in good faith but without warrantee and is to assist your application. However the use of this product being used is beyond their control. The manufacturers can accept no responsibility whatsoever for any damage or failure arising from its application or use. It is totally the responsibility of the user to insure that the product is suitable for its intended use.