I've never had issues using GE silicone I for doors and windows. All of the ge silicone I is all the same as far as I know, they just repackage it for different uses(i.e. kitchen and bath). I can't really comment about the GE II stuff. Heard that anti-fungal stuff wasn't good for the tank, never wanted to find out for myself. I would just use the GE I, a bunch of people have used without any problems. And, it's a bit cheaper than the other stuff so that's a plus.
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