As Chienworks said, and pay attention to the contrast. I've found that most of the time, when I add text to cover things, depending on the size, that sometimes the contrast starts to lighten up. It's very inconsistant and if you use a small enough individual text, you may not see anything. But I tend to like completely covering TV station logos and ad or news scrolls with text and that's when I run into trouble. (I'll blow up a hyphen or whatever to the size I need, even if I have to type in the numerical value to get the size I want.) I use wingdings and webdings too.
EDIT: I forgot to mention, the reason I use text is because it renders much, much faster than blurs or cookiecutting. If I could only figure out this contrast thing. If you use small enough text characters, you should be fine.

Is there an easy way to lock the image/icon to movement?
I have two tracks with a webding on each covering the breasts at the first frame you see it.
How do you get a webding/wingding or image to stay over (lock on), to ...let's say just the nipples if she's moving a bit? What are the steps I should take in this case.

Right now I'm using a black bar censor which is working, but I'd like to use two icons or other instead.
How do I motion track those webdings.

thanks