SPRAY "A" PLUS Lead free. A clear, low melting glass, ground to micron size and suspended in a medium, suitable for brush or spray application. Spray A may be applied to fusing projects to prevent devitrification on the glass surface, or as an overglaze for dull or matte surfaces, or even previously devitrified surfaces. Fire to minimum 1300 degrees F (704 degrees C). 16 oz. (473mLs).