The offending pot before spraying "Before" closeup After spraying, when the surface dried off a bit Two days later (the greener color is basically due to a different lighting setup) I think you'll agree that the mold is pretty much gone. My remaining questions are "Will the cinnamon adversely affect seedlings?" and "Will it hurt germination in any way?" I going to have to wait on the germination question but I took before and after shots of a pot of spatulata seedlings and I'm not seeing any damage: Two days later: All in all, I think that I'm going to be using the cinnamon spray. If there's any adverse effect on germination, I'll update this entry.
(And I don't know why there's another copy of this pic attached:)