Roof Melt

WOW!!! ROOF MELT I was excited when I saw the ad on the tv then I bought it, Should have known better.
When you get the tub I am in Canada so I had to get my local Hardware store to order it in, all adding of course to the excitement as I currently have a nice ice dam on one part of the roof of my house.
Well it duly arrived as promised a tub containing little white pucks of ROOF MELT. I read and then re read the instructions it sounded just too easy JUST CHUCK UM UP ONTO THE ROOF.
I did. The instructions with the roof melt even tell you how much to space them out, this i did now it in fairness does say that you will have to wait about an hour or so for the first signs of action.
Well a week later and three applications in the same area so now i have put about half the tub of ROOF MELT 25 pucks in the one area and guess what. I STILL HAVE A GREAT ICE Dam.
I guess I should have know better.