*Communication* **Glossiness Evaluation of Coated Wood Surfaces as Function of Varnish Type and Exposure to Different Conditions**

**Emilia-Adela Salca 1,\*, Tomasz Krystofiak 2, Barbara Lis <sup>2</sup> and Salim Hiziroglu <sup>3</sup>**


**Abstract:** The objective of this study was to evaluate the glossiness of black alder wood (*Alnus glutinosa* L.) samples coated with two varnish types as a function of exposure to dry heat and artificial aging. The chemical resistance of the coated samples to cold liquids was also evaluated. Based on the findings in this work, it appears that the varnish types and their structural differences influenced the overall glossiness of the coated samples. The UV varnish exhibited higher gloss values than those coated with the water-borne product within the range of silky gloss and silky matte grades. The heat exposure influenced the surface glossiness of the UV-coated samples more than the samples coated with water-borne varnish. The overall gloss values of the samples decreased with the exposure time to artificial aging, resulting in no layer cracks. The cold household liquids left less visible traces on the surfaces and alcohol was found to be the strongest agent. This study could have practical applications in the furniture industry to produce value-added furniture units according to their specific conditions of indoor use.

**Keywords:** artificial aging; coating; gloss; properties; varnish; black alder wood
