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206 Posts
I just applied my Great Stuff to the background last night, and now I noticed that it has shrunk and peeled off the back wall. I even applied silicone to the back wall beforehand to try and get it to stick better, but that seems not to have helped. It also really warped the egg crate structure that I built for access to the water pump. I'm not sure if that's a problem or not.
So why did this happen and how should I go about fixing it?
Gap in-between the tank wall and the duct for the fan. Should I just fill with new GS?
Huge gap... I can fit my hole hand in the gap. Should I fill that with new GS too I suppose?
Warped the egg crate structure. It won't push or pull back into the proper position, so can I just cut the GS to make it go back in place, and then fill in the cut area with new GS?
What can I do to prevent this from happening again? I only have one can of GS left, and I really don't want to order more. I also don't want to use the regular (yellow) kind I can get in the store.
So why did this happen and how should I go about fixing it?

Gap in-between the tank wall and the duct for the fan. Should I just fill with new GS?
Huge gap... I can fit my hole hand in the gap. Should I fill that with new GS too I suppose?


Warped the egg crate structure. It won't push or pull back into the proper position, so can I just cut the GS to make it go back in place, and then fill in the cut area with new GS?

What can I do to prevent this from happening again? I only have one can of GS left, and I really don't want to order more. I also don't want to use the regular (yellow) kind I can get in the store.