Thanks for the tip, Smittenheart.
I made another batch today using only the CP method and I covered it with saran wrap. I made a stupid mistake on this last batch, though. I wanted to try to color the top of the soap brown, so I mixed a couple of tablespoons of cocoa powder with some soap and then poured that over the rest of the soap I'd already put in the mold.
Sounds good, right?
It turns out that I used a tin that said cocoa mix instead of plain cocoa powder. I didn't realize it until I was cleaning up and went to put the tin back in the cabinet. In addition to cocoa powder, it contained various forms of sugar & milk.
I took off the extra insulation and found that it had already started to gel in the center. I guess I'll just have to wait and see how it turns out. I'll be a little more observant next time!