I will only mark if I am quilting with a walking foot and need lines very evenly spaced. Or, as someone else mentioned, I will mark the center line of a feather. And when I mark, it's with Crayola washable markers. I've never had any difficulty with them not washing out. Other than that, no. I have done both meandering and also a sort of free-hand feather border. Though my FMQ has improved over the years, it's never perfect, and I really don't care. I love and enjoy my quilts just as they are. Even when doing hand quilting I avoid marking like the plague, but will use a hera when necessary.