Protective coated pine is widely available in the Australian market in a broad range of accurately sized and milled products for a variety of external, above ground applications. Posts, hand rail materials, fascia and barge boards and many others are available in sizes to suit most applications. The timber is typically LOSP (Light Organic Solvent-borne Preservative) treated giving an H3 level of treatment and then finished with a premium quality oil based primer. The coating is for stabilising and protecting the material during storage and installation and not necessarily a priming coat as part of the painting system. LOSP H3 treatment is suitable for external above ground applications and is ideal for finished products such as handrails, pickets etc.
H3 treated timber is not suitable for any in-ground applications. Posts should be supported clear of the ground with post holders / brackets / stirrups as required. Where the material is cut, the exposed material should be coated with an appropriate paint on preservative, either a liberally applied water repellent preservative or a thick coating of preservative paste (copper naphthenate) emulsion to ensure the "envelope" of treatment is complete.
Painting Procedure
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The protective coating primer may tend to deteriorate over a period of time and become slightly chalky - unable to bond adequately to any additional coating systems without some preparation work. A simple way of testing whether there has been any deterioration is to cut a small "x" through the existing coating system with a sharp blade. Press some cellulose sticky tape firmly across the cut and then rip off the tape. If any of the coating comes off with the tape then the primer is not adequately sound and must be removed by sanding.
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Fill nail holes with an exterior grade wood filler.
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Sand back until the surface is completely free from all dirt and degraded material and then dust off the surface.
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Prime all surfaces, paying particular attention to cut ends and joints, with a good quality solvent-based alkyd primer. Water based primers are less effective in this application.
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Allow to dry as per the manufacturer's instructions and lightly sand to an even finish.
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Apply two coats of premium brand acrylic exterior grade top coat to the manufacturer's recommendations.
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