i used the foam in a can once this summer on a wheelbarow tire in a pinch. too lazy to run 30 mins one way to the store and 30 mins back. so i tried the foam. made a hell of a mess and i had a tough time getting it in there evenly. i got mad, cussed a lot and went inside to drink beer. sure nuff, the next day, it had cured somewhat decently and worked OK. there were still some empty spots in the tire and i sure noticed it. but overall, id try it again if i had to. not on anything larger than a cart tire tho. don't think itd hold any real weight.