I'd just go for quality outdoor paint + primer, and maybe kilz inside. Let it dry for 2 days. The fumes will go away, but the quality of paint wont. If you go water based with fancy stuff it might not last.
Is it this one?
I was just searching for some questions on it too.
It has 2 inside roosting bars that sit a few inches above a removable poop tray and 3 nesting boxes inside. The boxes are right were that small window is. It also has 2 roosting bars in the fart par of the pen enclosed by the...