Very nice site here Jim.
The silnylon tent floor treatment seems like a great idea those who need an enhanced/more waterproof floor. Personally, I'm fine with just a standard silnylon floor and I don't even use a groundcloth anymore with no problems at all. I'm prepared to make field repairs though if need be.
The tent floor treatment article had a lot of interesting things about silnylon waterproofness. I was dismayed to learn that waterproofness deteriorates so rapidly with use. I have a Stephenson's Warmlite silnylon tent that I have been using moderately for 6 years now with no leakage yet. I believe Stephenson's is one of the pioneers in using silnylon for tents - expensive but one of the lightest commercial tents around.
I saw an interesting article on the net by hammock dude Ed Speer. Ed recommends periodically treating silnylon with commonly available silicone spray to restore waterproofness >>> http://www.hammockcamping.com/Free%20Reports/Silnylon.htm
Has anyone experienced silnylon leakage due to deterioration of the factory treatment? And has anyone tried spraying silcone on their silnylon to restore waterproofness? I might try this with my tent in the future if I experience leakage but I would want to make sure that this can be applied safely without damaging the fabric.
I'm looking forward to Jim's future article, Silnylon: The Inside Story .