Casting resin is a liquid material that hardens into a solid form. It is often used in art, crafts, and industrial applications to create clear, durable objects. The process involves mixing two parts, usually a resin and a hardener, which start a chemical reaction when combined. The mixture is then poured into a mold and left to cure for several hours or days, depending on the type. Once cured, the resin becomes solid, often with a smooth and glossy finish. It can be used to make jewelry, decorative items, coatings, and prototypes.