Water activated EXO-SET UNO is installed by casting, trowelling and tamping, and has a final set in about 2 hours. It requires no curing time, and because it bonds well to existing refractory, it is suitable for emergency repairs and patching. It is available in various grades including an 85% alumina product and a 65% alumina formulation. Both products are naturally nonwetting to molten nonferrous metals.