Krylon spray paint works great on metal. I've used it on all kinds
of surfaces, baskets, metal file cabinets. I even re-did my kitchen
with it. I found these terrific 1970's metal lab cabinets with
drawers, cleaned them up well and spray painted the drawer fronts.
(sanding any drips with 1500 grit) The paint job is holding up very
well after two years.
Krylon for metal. You won't have any trouble.
Ah, I read again and you want snow. Buy some of that "Stone Fleck"
paint that they sell in the spray paint aisle to make your trees
bumpy. Then after that dries, paint over it with a white spray
paint. Then, if you still have time, check the craft store for an
iridescent spray if you like, and spritz that here and there.
Another advantage of spray paint is that it dries very quickly,
which should help you get your project done on time.
Chicago area, Illinois, USA
Metalsmith, Certified PMC Instructor
Studio 925; established 1992