I have used it in both for wall hangings. The only thing that has happened so far is a tiny little hole effect when held up to the light. But since it's against the wall, doesn't matter. I have also used thread in the bobbin but did not like the dot look. I don't think I would use it on a real wash and use quilt. It is as fine as baby hair and just wouldn't hold up, no matter how careful I was.