A new polyurethane-based coating (LLPuC) composed of PDMS-grafted hydroxyacrylate and polyisocyanate offers a transparent, self-cleaning solution. The coating achieves 91.79 % optical transmittance at 550 nm and shows low water and oil sliding angles (WSA: 11.5°, OSA ≤ 15°). The coated modules recovered 92.83 % of their original efficiency after self-cleaning, demonstrating practical outdoor performance. Reading tip: Functional CoatingsThe “EC Tech Report Functional Coatings” gives you an up-to-date bundle on automotive coatings with articles, videos and other handpicked content. Mechanical strength and environmental stabilityIn addition to its omniphobic surface, the LLPuC formulation features good adhesion, abrasion resistance, and environmental durability, making it suitable for transparent outdoor applications beyond PV.