Our first-aid society at school bought 2 small cans of a simlar aresol spray claiming to stop bleeding. after somebody a pupil stuck his arm through a window, he cut himself fairly badly, but it was easily controlled. i then sprayed his arm with the powder to see if it was effective. it was not. it just sort of made a barrior through which the blood seeped through sfter s few seconds.

If new products have come out (we bought this stuff about a year ago), it may work better. but for now, I think direct pressure and elevation do a much better job. still, i dont think that future products should be written off - a simply spray on an arm full of glass might be better than direct pressure...