We're going to have to change the name of this forum from "Tobacco and Libations" to "Answer Brian's Dumb Amateur Questions about Home Brewing."

On the recommendation of All Seasons, I've been using powdered Potassium Metabisulfite, mixed 2 ounces per gallon of water, as my sanitizer solution. However, I've got two questions about it:
1. How long do I need to let my equipment stay in the solution before it's safely sanitized?
2. Am I correct that K-M is a "no rinse" sanitizer? For most of the popular sanitizers online (bleach, B-Brite, Idophor, Star San, etc) there are instructions on whether you need to rinse thoroughly afterward or not. However, I can't find any confirmation on whether Potassium Metabisulfite is "rinse" or "no-rinse." I assume it's "no-rinse" since K-M is also used in Campden Tablets for sterilizing must prior to pitching yeast and stuff like that, but I'm not sure.
Also, here's a bonus question: for winemaking, I have found contradictory information online about whether to add potassium metabisulfite when racking from the primary fermenter into the secondary fermenter. It seems to me like it's counterintuitive that you'd want to do that, since it stops any further yeast reproduction, but I'm not sure. What do you guys do?
Thanks,
bd