What temperature is the snow?
Hi gb
Snow/ice has a vapour pressure even at sub-zero. That's why exposed ice can't last in space above about -100 C, but a bit of regolith can slow it down by trapping the vapour and providing a bit of counter-pressure.
As for the spray, it'd evaporate rapidly in sunlight, or freeze by evaporative cooling in shade. No liquid would make it.