Update (after 5 weeks' use) - The best way to tell if private info is being covered is to look with a magnifying glass. Sometimes things that appeared well-concealed become apparent when magnified. In those cases, a second swipe often helps.Certain kinds of writing, like large fonts or printed inks with some sheen, won't be covered well, no matter how many times one rolls over them.As in some other reviews, my roller ink grew faint, and it happened after only a few weeks. I refilled the ink, andSee full review