This is a great marker for filling in large areas on posters, etc, but do mind the caution on the packaging, as I learned this one the hard way! I was working on several posters in our basement, which I thought was a large enough space with some good ventilation. Well, it wasent as our whole house smelled for over a day and I had the worst headache imaginable. So, my recommendation, if you are going to use this - use it outside. Otherwise, excellent for getting the job done!