Rain crusts are not always dangerous. Like a sun crust, you have to watch closely to see whether the rain crust is soggy or frozen when the next snowstorm begins. If it’s wet, the new snow will usually bond to it and you probably won’t have any problems—at least in the short term. If, however, the rain crust is well frozen and the next storm begins with low density dry snow, then it’s like trying to make feathers stick to a sloping pane of glass. You can expect fairly widespread soft slab activity running on the hard rain crust.
