i was at refina's trade counter when i bought mine with some other stuff, when the bloke behind the counter whent to get some stuff a local spread stood-in there said to me they are crap mate , but i was going to use it on a modified screed so i thought i would give it a go !, when i decided to give it a go i used it for three-four trowel strokes and knew straightaway it was not working so washed -it and put it away ........