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I used the red can for most of my builds. I just gs right to the glass(red can). The black foams dont bond well to glass. I did one build pond and stone gs and it came off after awhile. However I was watching one of grimms youtube videos and he had mentioned siliconing the glass if you are going to use the black foam. I just finished a build with black foam and I did silicone the glass before adding the foam.