Yes, thanks, someone mentioned that way up above, in the thread, and I am now considering that as well. I did put a solve on the question, but I am even doubting that now (because even the paint rubs off with paint pens). I think the heat-shrink may be the better option, to be honest. It does not even need to be light, because it is visible.
I simply do not work on anything with any significant wattage or current anyway. Even so, even the heat-shrink can handle quite a bit of wattage heat.