Never mind critters. I made the mistake of using Johnson's baby powder (once). The smell is a bit strong for comfort, made me think I was sleeping in a nursery, and it lingers.
Generally, I have not found that the cured silicone needs a powder cover, even thicker anti-slip layers on the floor. I've yet to see any problems with a tent sticking together in storage. This mixture cures fast.
I sealed a Shires Double Rainbow with GE Silicone diluted with mineral spirits (and yet another Double Rainbow with the Mcnett product, somewhat less successfully). The gain in weight was about one ounce for the one with GE Silicone. It might have been less, had I applied sealant to a narrower band along the seams, but my local hardware store didn't have thin foam brushes. Having the tent up and tautly pitched seems to me to be essential, for the reasons touched upon by a previous poster.
One thing not mentioned in Jay's article is that a thin solution of sealant in mineral spirits can be used to rewaterproof dodgy areas on silnylon. I have an Equinox poncho that I use (in addition to its intended purpose) as a groundsheet, tarp, waterproof pack lining, etc. etc. It's held up well to this abuse but before the weather cools I intend to recoat it with a thin silicone slurry. This might also be a worthwhile procedure for silnylon which is not particularly well treated at the outset, I would expect.
One further point is that silicone isn't that readily soluble in mineral spirits. Not bad, but it can take a fair amount of mixing to get a solution in which the silicone's evenly distributed. I make mine up the night before, in a sealed jar, then shake heavily before use. It will keep some while if the jar is airtight, BTW.
Thank you, Roger, for the interesting information on silicone tape. I have to look into this.