Yesterday was the first day I did more than a couple bars of M&P at a time. For reasons too boring to explain, I start the process in the micro-wave, and finish it in a roaster oven half filled with semi-boiling water. There are 3, four cup measuring cups in the roaster oven, each of them holding 8 ounces of melt. By the end of the second batch, there was definitely something that felt like a thin layer of soap coating my tongue and roof of my mouth. If it's in my mouth, it's in my lungs. I don't think it's toxic, and I've read the lungs are sort of self-cleaning, so I'm not worried about this one incident. But I am not going to keep doing it. Anyone have a similar problem? Anyone do anything about it?