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Baking soda: It sparkles.
Baking soda looks great but it can have a long lasting impact on the layout and equipment. When I shot the cover for RMC 12/01 I used baking soda. I am still finding equipment with corroded wheels and axles! On my trainmasters the baking soda made it up to the brass wipers above the trucks. Everything was corroded. Apparently that is what baking soda does! That took some time to correct!
The question was about temporary snow. If it is kept dry and cleaned off promptly' it should not have any negative effects. I imagine it would be hard to thoroughly vacuum off fine-powdered Hydrocal from the scenery (like ground foam). To me using Hydrocal would be like using talcum powder (way too fine). Baking soda is more coarse so it will be easier to vacuum it off cleanly.
I have used WS lightweight Hydrocal for temporary snow in photos for several years. We have had no issues as a result of it on a layout designed, built and maintained to deliver highly reliable operations. Here is an example:
Mark, that snow looks very permanent! Do you have any photos of that part of the layout after vacuuming the snow off? It would be interesting to see how it looks like in a warmer season.