Ice the aircraft killer!
The performance of a light SE aircraft decreases very quickly when it picks up ice so the simple rule is don't get into icing conditions that you can't get out of.
First Never fly IMC when the freezing level is below the MSA, what ever happens you must be able to decend into walmer air to de ice the airframe.
It is sometimes best to climb though a thin layer of cloud to get VMC on top even if this will result in a small amount of ice but it must be remembered that aircraft performance will be effected by any ice and a light SE will only have a marginal ability to "out climb" the icing layer.
Prelonged flight in icing conditions will result in the aircrafts ability to fly being so reduced that it is likely to become very hard if not imposable to control.
It is most likely that the newer "glass" aircraft will suffer greater performance degridation than the older "fat wing" types.