Application of water repellent formulations to timber surfaces offers protection from the weather, reducing degrade and movement. A novel test method has been developed to evaluate the comparative efficacy of such formulations when samples are exposed to weather. The method uses sapstain free sapwood of defect free, untreated, seasoned Radiata pine, (Pinus radiata D. Don.) Water Repellency was determined before exposure and at exposure times of 3, 6, 9, 12 and 15 months, using the method described in the Standards Association of Australia (S.A.A.) standard A.S. 1607-1974. The performance of six commercial and experimental water repellent formulations subjected to this exposure regime is reported. In conjunction with A.S. 1607, the method offers a system for the rapid comparative evaluation of water repellent formulations under field test conditions.

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