TENAX Crystal Solid Knife grade is a premium Italian-made transparent knife-grade polyester mastic adhesive engineered for professional stonework where a virtually invisible repair, bond, or fill is required. Its high-clarity, thixotropic formulation makes it ideal for use on natural and engineered stone surfaces, especially when seams, chips, cracks, or joins must be hidden from view. Designed for both vertical and horizontal applications, Crystal Knife Grade offers an extremely smooth consistency that cures with a glossy, polishable finish and can be tinted with universal color pastes for seamless integration with the surrounding stone. It bonds exceptionally strongly and is suited for precision stone fabrication, repair, and restoration projects. Key Features & Benefits: Ultra-clear, virtually invisible finish, perfect where aesthetics matter most. Knife-grade, high-viscosity paste stays neatly in place on vertical surfaces without dripping. Smooth consistency that spreads easily and cures to a high polish. Strong, durable bond suitable for repairing, rebuilding, and filling stone, marble, onyx, granite, and engineered surfacing materials. Colorable with universal pastes for custom color matching. UV-resistant, ideal for interior use; not recommended for sub-freezing conditions.