You all have heard of or used "Great Stuff foam" right?<br /><br />It comes on a can and its used for sealing up stuff.<br /><br />I got it on my right hand, as soon as I for it on my hand I took a rag and wiped it off. When I got into the light again I saw that where it was on my hand is black, looks like I have dirt on my hand, that was yestersday, and after washing it many times, it won't come off. <br /><br />Any suggestions?