Duncan Ceramic Spray Sealers super flat matte 12 oz. Ceramic Spray Sealers are final spray coatings that produce smooth, hard surfaces and are used to brighten colors and protect the finishes of objects decorated with nonfired color products. Super Matte produces a smooth, even, flat-matte finish on nonfired acrylic and translucent colors, and works particularly well on realistic-looking animal figurines. It slightly softens underlying colors and provides a shine-free protective surface.