I find wrapping spherical items like the round bath bombs a pain in the patootie. I would think using saran wrap would not be a very attractive look due to wrinkling, though if its other molded shapes like butterflies, etc, it might look better. Plus it is a lot more fragile than shrink wrap. I have a bunch of shrink wrap bands for my lip balms and other jars & bottles, but I haven't picked any up for bombs/fizzies. Mostly because I think I'm just going to sell it as fizzing bath powder. If I was going to do molded fizzies, I would probably just try to put them in a jar and let people fish them out on their own. I'm also kind of a klutz, so I'm more likely to break them when wrapping (yes, I shattered a 2 week old bomb
) and unwrapping.
I hate trying to mold that stuff, plus I live where its fairly humid for 50-70% of the year so letting them sit in the house, even just a day or two to dry out enough to not crumble when wrapping, isn't very ideal. Right now, its 60% humidity in the house, and will probably go up because its raining today and I need to do some laundry and wash dishes.