I always use my spare spools....... ya, I'm always the odd one in the bunch
On the ice, I strip off the used line from each trip, large fish or during a great bite. Don't like loosing fish due to a nick or pike rolling the line.
My light action rod I spool with 6lb and one 3lb...... I use the 6lb for walleye and sauger and the 3lb for perch and crappie..... I still carry 4 - 6 rods and use both spools for all. Some spools go unused for the season. Also it's no fun being out 8 miles on LOW and get a rig stripped
Works for me.