Let me start off by saying that I have no personal experience trying to cap my own DNP. I'm glad that there appears to be a good number of quality sources who are providing it. But I've heard the exact opposite of what you say. I've heard that it's very messy, everything gets stained yellow, and you have to have effective venting, as handling the power results in very small particles floating around that may seem pretty insignificant, but in total can be meaningful and hazardous to the person doing the capping.