Acrilex 521 blue stained glass enamel, 37ml, provides a dense, opaque primary blue coating with a glossy finish on smooth surfaces. Its self-leveling formula allows for streak-free application with a soft brush on clean glass, porcelain, earthenware, ceramic, wood, and plaster. It air dries completely in 24 hours and is widely used to create areas of solid color and striking contrasts in decorative stained glass. It should be diluted with solvent or thinner for cleaning materials. The opaque blue tone is essential for solid fills, geometric details, and vibrant finishes on glass.