Why is not water used in gloss paints?

Water is not used in gloss paints primarily because gloss paints are typically oil-based or solvent-based, which provide a durable, high-shine finish that water-based formulations can't achieve. Oil and solvent bases allow for better adhesion, leveling, and drying characteristics that are essential for a smooth, glossy appearance. Additionally, water can dilute the paint's pigments and binders, affecting its overall performance and finish quality.