Soudal T Rex crystal is most effective sealant on Earth. This tool made from SMX polymer with the best quality. This product is the solution for all visible elastic bonding and sealing. T Rex crystal also applied in water. Some excellent features of a product 1) Excellent mechanical properties 2) Maximum elongation of 300% 3) Paintable with the water-based system 4) Odor and isocyanate free.