Exactly, that's why I put recommended in quotes. If one knows the leakage resistance, he would then assume a resistance of lets say 100-1000 times lower than that, is good. It would be high enough for prevention of charge migration and at the same time low enough for the leakage. But how to measure the leakage? So - how much low is low enough and how much high is high enough? People say somewhere between 10MOhm and 100GOhm. This is a huge difference. What I'm trying to do by measuring, is to get these limits closer, so I can try different coatings (and solutions) - if they can give similar resistance and are stable enough.