The weathering properties of various transparent and semi-transparent exterior finishes for New Zealand-grown radiata pine are currently being examined. After 12 to 16 months' weathering, unpigmented water repellents have failed to provide satisfactory protection from weathering under field test conditions. With the exception of two formulations, penetrating oil-based stains are already showing signs of deterioration by surface erosion. Non-penetrating solid colour stains have generally remained in good-to-excellent condition. Acrylic emulsion formulations are the most durable of the transparent finishes under test.

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