I went down that road too many times. Last summer, while I was landscaping I weedwacked a bunch of it and it plastered my legs. Man that was bad. It was so bad I went right to the doc. He gave me something internal and it was gone in like 2 days, but since then I found Ivy Block. That stuff rocks. Ivy Block before and tecnu after. I only got it 3 times minorly out of the whole summer, still as a racer and landscaper.