The aim of this work was to investigate the formation of gloss and adhesion in accelerated thermal aging test selected lacquer systems formed on pine wood. Window elements were finished with lacquer systems, including impregnate, primer, and inter- and top lacquer layers in two colour versions white and cypress respectively. The range of investigations included gloss measurement and adhesion (pull-off method) of coatings to a substrate. Based on the contact angle, the values of surface free energy (γS), work of adhesion (Wa) and surface tension at the interface (γSL) were calculated, together with their dispersion and polar shares. On the basis of the experimental results it was stated among others, that tested finishing’s were characterized by a semi-gloss effect, which was stable under thermal aging cycles. The lacquer coatings showed good adhesion to the substrate. The values of the Wa parameter remained at a high level as well. In turn the γS parameter indicated the occurrence of strong adhesion interactions in the substrate and particular layers of the coating systems. Aging processes had no significant effect on the manner of the obtained relations.