Scooby I'm sorry if I sounded flippant, I had no wish to do so. Your second post states that the aircraft had flown for 5 hours previously, thus it was cold soaked. At an OAT of -10, snow will not stick to the surface. The problem I'd have with de-icing the aircraft as opposed to sweeping the snow off or just letting it blow off on takeoff, is that by wetting down the wing you provide an excellent base for the falling snow to stick to. This would create a contamination problem where none existed before.. .I don't have the tables in front of me, but the holdover time for Type 1 fluid by itself is very short. Under the conditions you describe, if you must de-ice, Type 1 at a temperature of 110-120*F should be used to de-ice, followed by an application of Type 4.