Oils are used to treat wood surfaces for interior and exterior use. The addition of pigments can provide additional visual effects, such as a rustic appearance that highlights the wood pores, while increasing the protective effect of the coating against photochemical decomposition of the wood substrate. In our research, instead of classical pigments, we used a natural and renewable raw material, liquefied wood (LW), which we mixed in two proportions with two oils. The mixtures prepared in this way were applied to samples of beech and ash wood. After application, we first monitored the drying rate and also determined properties such as colour, gloss, and surface resistance to cold liquids and dry heat after drying. We also subjected the surfaces to artificial aging under ultraviolet (UV) light to verify the role of the LW additive. Our research confirmed that LW is compatible with tung oil and Bioimpregnol WM and can therefore be used successfully for their pigmentation. We also confirmed that the addition of LW to tung oil does not affect the resistance of surfaces coated in this way to cold liquids, nor the resistance of the surfaces of both oils to dry heat. Unfortunately, the addition of LW to oils slows the drying rate. In addition, we have found that coatings pigmented with LW are not the most light stable.
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