Well I finally tried this tonight, after getting the tools to remove my cassette and thoroughly cleaning everything yesterday. Took me forever to find that Gulf Wax stuff, finally found it at Kroger. I cleaned everything yesterday in degreaser, but I think my chain didn't get totally clean. I used an old pot for the wax, sitting above another pot with boiling water. I decided for this first try I would remove my chain using the Missing Link piece, and let it soak in there for a few minutes. Then I fished it out, let it cool over the kitchen sink, and put it back on the bike. Was a little tougher getting the Missing Link to seat again as others have reported. I haven't had a chance to ride the bike yet.
After I cleaned up the drivetrain yesterday, I was short on time heading out to a ride, so I just threw some White Lightning on the chain. Unfortunately I think this made things dirty again, or at least brought out more dirt that was caught up in the chain that the degreaser didn't get out.
I really want to try this with a brand new chain and freshly cleaned chain rings and cogs. I think I will also be using the drape method next time. Though I won't let the chain drape over the bottom bracket. With the chain on the smallest ring and next to smallest cog, I can just pull the RD cage and let the chain droop, then let it pull back up again. Turn the crank a bit, and repeat. No need to get wax all over the bottom bracket.