AMMO by MIG Powder Snow

From the Manufacturer:

Component of the WINTERIZER set that contains all the products required to recreate the texture of snow on any surface including terrain, vehicles, and buildings. Powder Snow is a fine white powder perfect for simulating pure and freshly fallen snow. It can be used in any scale from 1/16th to 1/72nd, providing your models, small scenes and dioramas with a highly realistic effect much like actual snow. This product must be mixed 50/50 with Snow Blinder and a few drops of Glossy Varnish. The resulting mix should be applied using a brush, and can be diluted with water to make it more fluid. The mixture dries in 12 hours. The brushes can be cleaned with water.