TETON-BLACK 180 is a premium-quality, water-bonded foundry sand formulated especially for high temperature metal casting applications in the small shop. When properly used, it can provide exceptional surface finishes with respect to most competing sand products on the market. TETON BLACK 180 uses premium olivine sand which has greater high temperature stability, provides better surface finishes, and provides longer life than silica or other cheaper sands. TETON BLACK 180 is especially well-suited for use as a facing sand--the sand used directly next to the pattern in high-detail casting applications. Please note that as with all water-bonded foundry sand TETON BLACK requires the addition of moisture (water) in order to work. This is best accomplished by using a spray bottle set to fine mist and mixing the water into the sand while spraying. Sand has right moisture content when it sticks together aggressively, but does not leave moisture or "sticky" sand particles on hand when squeezed. Storing product in closed, airtight container can help minimize needed water additions. Please feel free to contact us via the "contact seller" link on here. We are glad to assist with any technical questions regarding this product.