Now, here's where the magic begins. Mix Zoopseal Part A with Part B and let it catalyze for at least four hours. When first mixed, the solution turns bluish but will go clear-to-slightly-yellow once fully catalyzed. We followed this procedure per step, but realistically, mixing the solution well in advance might be a good idea. As Murphy's Law dictates, the cleaner the parts, the dirtier they'll get if you let them sit.