I have noticed the same thing. I could be wrong but it seems like the basic colors of Monokote (ie standard reds, blues, yellows, white, etc.) shrink well. I've also had good luck with transparents. I've never been able to get aluminum colored Monokote to shrink well at all though, no matter how careful I was. Like I said in my other post though, I think I'm getting better at the whole covering thing, maybe I'd do better with the aluminum now. The white Monokote on my Cap 232 is looking very good so far and I'm using left over Ultracoat on top of it for the trim.

I haven't noticed differences between Ultracoat colors so far.