i use diatomite earth, u can get it a pool supply shop's(25# bag for about $ 12 bucks) it is used as a filter medium. but i have found it to be a great scale snow . i use 50/50 white glue, or liqutex matt medium to glue it down, first brush or spray glue on the places you want the snow then with a flower siffter from above just let it snow! when dry shake loose snow from model or dio base.for a finer finish rub snow with your fingers to smooth it out a bit. if i need to apply more snow i then brush on more glue and make it snow again. to add more of a gloss finish try gloss medium sprayed over the top. the name of the game is to just experiment, its cheep and the 25# bag i got will last for many a snow storm,,,,,,good luck!!