The Primo Kiln Shelf Primer is specially formulated for glass fusing applications at high temperatures, 1550°F and beyond. Designed to prevent glass from sticking to kiln shelves, it ensures a smooth release without scaling on transparent glass. As it heats past 1200°F, the primer turns into a fine powder, allowing glass to "float" without adhering to the shelf surface. Ideal for high-temperature fusing projects, this 24 oz. tub offers easy cleanup—simply use a brush or vacuum without the need for scraping. Not suitable for priming molds or slumping forms.