Abstract
Abstract Transparent and semitransparent coatings applied to wood products often fail due to photochemical degradation and colonization by black stain fungi. Longer-lasting coatings are needed to enhance the competitiveness of wood products used in appearance applications. We hypothesized that shell treatment with carbon-based wood preservatives combined with a protective precoat containing organic ultraviolet (UV) absorbers and hindered amine light stabilizers would control black stain fungi and provide enhanced coating service life. After 3 years of field exposure at Maple Ridge, British Columbia, and Saucier, Mississippi, samples were evaluated for degree of black stain, coating degradation, and substrate damage. Heartwood substrate, preservative treatment, and use of protective precoats were associated with better stain resistance and enhanced coating performance. Use of preservative treatments and UV protective precoats is recommended to enhance the service life of high-quality transparent and semitransparent finishes. However, further work is needed to enhance the performance of transparent and semitransparent coatings to meet consumer demands for low maintenance.
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