Multicam paint job on a mask?
Seriously, I would not paint that mask. It already looks great with Multicam and since that is the case I would leave it alone. Now if it was black, or some other bright color (as in speedball colors) I would say to paint it. I don't regret painting mine, and the others I have done turned out very well. How well a soft mask holds up over time however can be debated. I have a HARD mask and it looks as good today as it did the day I painted it.