SPRESIN Flex-It 90 is a semi-rigid urethane casting resin engineered for abrasion resistance, tear strength, and consistent performance in both thick and thin castings. This two-part resin system cures into a tough material that holds its shape under pressure, making it a favorite for casting molds, gaskets, rollers, seals, and functional parts that experience frequent use or mechanical stress. Unlike softer urethanes, Flex-It 90 offers rigidity in mass castings while maintaining flexibility in thinner cross-sections. This makes it incredibly versatile for creators who need strength in one area and bendability in another. It's commonly used in both prototyping and production settings, thanks to its reliable performance under strain, vibration, and repeated motion. Flex-It 90 also stands out for its abrasion resistance, making it ideal for molds that need to handle tough materials or repeated demolding. Whether you're creating urethane parts, high-use gaskets, or edge-molded rollers, this resin provides clean handling and consistent results with every pour. Its solid chemical resistance also makes it suitable for casting in environments that involve oils or other solvents. This 1 Gallon kit is a smart choice for medium-scale casting or building semi-rigid parts with consistent performance. Whether you're exploring alternatives to epoxy or scaling up your DIY prototyping, SPRESIN Flex-It 90 delivers strong, semi-rigid performance with pro-grade durability and ease of use.