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Re: GE silicone 1
When using PVC or acrylic solvent Primer is not always nessary, and the bond is more like welding. It actually dissolves the material and melds it together as it dries. Making it impossible to take apart once dried and correctly joined.
Pretty much any 100% silicone (with no additives) can be used. You'll know your ok if it is food grade, and or can be used in kitchen or bath environments. I've used GEI and II, with no ill effects.
Preparation of any surface is important, and as Susan mentioned roughing up the surface can help. If there was any dirt, grease, oil, soap, it won't woke well. Wipe down with rubbing alcohol. Let all your projects that have 1/2" or less of silicone sit for min of 24 hours to dry and off gas....
Another handy item is 2 part epoxy putty, I recommend using aquarium safe if you have a "wet repair" as it is hard to tell all the ingredients in most putty's. (but again, the ones safe to use on drinking water lines are likely safe for fish). I also use JB weld quick, it is ok once it's dried.
And crazy glue is safe in any tank wet or dry, and will still bond wet.
"Buddha in your tank"