I knew this product I was using there more than 10 years but that disappeared DIY store shelves in favor of less efficient products bcp and I was very happy to have again effective when had to remove old wallpaper 35, so if it exists !!! And with good hot water tank and Perfax in, everything was phased out: thoroughly saturate the sheeting previously scratched, leave for 10 minutes and snatch zone by zone with a metal spatula style for filling cracks ... .Results guaranteed! A little bit of grain sander 120 and it's over, impeccable :)