guys you're so good I can't find anything to add up !!
I can only say by experience that whenever something doesn't make sense or you can't have the line yow want or the texture you want, it may be because there might be a small residue of an earlier object you have erased, or an opening in the loop that is barely visible, I like to zoom in a lot and examine bit by bit, sometimes I have to rotate around in order to find out where the funky bit is.
There are times when I cant paint stuff, and what I do is divide the whole thing into segments and isolate the problematic area, often times erasing a particular section and re-doing it solves the problem.
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