Duncan Ceramic Spray Sealers clear gloss 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. Clear Gloss and Clear Matte can be used under, over and between coatings of Duncan nonfired colors. To maintain a bright acrylic basecoat, spray on a coat before antiquing. No need to fire pottery pieces covered in this glaze as it makes your pieces more resistant to moisture for exterior use. Instructions for use printed on can, Made in USA