I love to hear that kind of info regarding using Dow silicone for resealing a tank. So as to not hijack the OP's thread, when you find the info, could you start a new thread? That would allow us to find your specific recommendations better.
I never really thought of glass as having pores but I realize that only makes sense. I do my best to get the glass as clean as possible when doing a reseal. My thoughts are that on a COMPLETE tank disassembly, it would be preferable to stone (or sand) the mating glass surfaces to remove the remaining silicone 'claws' to allow better adhesion between the glass panes. Just a thought.
Now, back to the original thread.
Eheim Pimpette #270
Eheim Pro II 2028; Classics Series -2215, 2217, 2260, 2262; Pro 2229 Wet/Dry