Boron Nitrate Spray II - High Temperature Release Coating - Awesome way to prime your molds. Especially useful with stainless steel. No more heating the mold to apply the primer- just spray on cold and use once dry. Lasts for multiple firings. One 13 ounce. will cover 75 yards. Boron Nitride Spray may only be used up to 1300 degrees F. It works for draping/slumping temperatures. It is not designed for use at fusing temperatures.