I found this stuff after talking to my mother of all people to hear it from i wonder if it's a fine powder or large chunks? There are a few versions of it so i wonder how it would do for scale snow?

http://www.amazon.com/Be-Amazing-INSTA-SNOW-1LB-BAG/dp/B000MLL7JU/ref=pd_sim_dbs_t_3

We sell this at the LHS. It looks good, but is always moist. After a few days it started to dry out and then there appeared to be less in the cup. I don't think it would be good for modeling as it would change over time.