EFFECT OF WEATHERING ON COLOR OF TWO COATING APPLIED ON CEDRELA ODORATA AND CARAPA GUIANENSIS WOOD

Carapa guianensis and Cedrela odorata wood are used for furniture and doors manufacturing in Costa Rica. Similarly, two kind wood coatings (nitrocellulose and polyurethane) are widely used in these manufactures. However, the effects of degradation ill the components of color (CIE L* a* b*) of these coatings by the weathering is little known for these wood species and these coatings. It was evaluated these coatings under weathering and it was found that surface painted with polyurethane and nitrocellulose produced significant change in wood color during the first 40-60 days of weathering and the intensity of color change was different in two coatings. The results showed that color changes in Carapa guianensis wood were lower measured by Delta E* than Cedrela odorata wood in two coating of surface treatments. Finally, it was found that there are relationships among wood color parameters (L*, a*, c*) with weathering time and the relationship between color parameters (L* - a*, L* - b* and a* - b*) are altered by the coatings.