Yep....I normally don't, I try my best to make everything exactly to the amount I need, but I have a couple of freezer bags full of it now for a cake for Friday night....and yes, it will go thru an ugly stage. I pack a couple of bags of frozen peas around the mixing bowl if it gets too soft while rewhipping, and will dunk it in a sink of warm water if I need it to warm up a bit as well. It comes right back to normal after a bit.
Remember to then put it on the lowest setting and let the paddle spin thru for a bit to get out any air bubbles.
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