Weathering assays study the coating degradation caused by its exposure to the action of ultraviolet radiation, winds, heat and humidity. The use of test specimens in different arrangements and exposure angles is intended to reproduce various conditions in which a product can be used. The purpose of this paper is to present the efficacy of an oil-borne varnish applied on treated wood exposed to weathering under four different methodologies after eighteen months through standards used to classify paints and varnishes performance under weathering. None of the specimens evaluated, regardless of the forms of exposure or treatment of wood, presented: calcination, blistering and cracking and only three were displaced. All specimens showed decrease in brightness comparing to the original characteristics. The cladding showed better results, with a slight color change and small leaching, defects that appeared in almost all other applications. Wood treated with MOQ® OX 50 (CCB) showed better performance than other chemical treatments, preserving the coating more efficiently.

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