The present study explores the hydrophobization of linen fabric through treatment with a paraffin-based composition modified by stearic acid, oleic acid, and melamine. The hydrophobic formulation was prepared in an ethanol–water medium, and fabric samples were treated via impregnation followed by thermal curing. The performance of the treated textile was assessed in accordance with GOST 3816-81, GOST 12020-72, and GOST 9733.4-83 standards. The results demonstrated significant resistance to water penetration under pressure, efficient droplet repellency, and preservation of hydrophobic properties after washing cycles. The chemical structure of the formed hydrophobic layer was characterized using Fourier-transform infrared (FT-IR) spectroscopy. Spectral analysis confirmed the presence of long-chain aliphatic hydrocarbons and functional
groups associated with melamine and fatty acids, indicating the formation of a stable hydrophobic coating on the fabric surface.