AirStone is non-flammable, non-combustible and safe to use around wood stoves and fireplaces. It has a Class A rating in accordance with ASTM E-84 standards.Click to see full answer. Similarly one may ask, can AirStone be used on fireplace?AirStone has a “Class A” fire rating and is safe to use around typical fireplaces. Pin It! When I got to the sides of the fireplace, I applied the corner pieces first and then added the rest of the stones to fill the sides, cutting to vary the length of each.Subsequently, question is, can you paint over AirStone? Interior stone, like fireplaces or even stone artifacts, will take a coat of paint much like a wall or a wooden structure. The most important aspect is the preparation phase. The stone must be correctly prepped before painting to make sure that the paint adheres to the stone face. Just so, what is AirStone made of? Airstones are increasingly being made from bonded glass beads and synthetic products like fiberglass.Does AirStone need to be sealed?When using AirStone as a backsplash, or an outdoor kitchen, we do recommend applying a sealer. Like natural stone, it will absorb grease and food splatters without protection. Use a high-quality brand for concrete, masonry, or porous stone.