Have you considered organic paint?
I feel it would be really good for the health of your chickens and yours aswell.
Here are 2 brands I like:
Behr
Benjamin Moore Natura
Hey,
I'm Tim. I'm a real chicken lover and I've got a nice coop I built by myself.
I hope I'll be able to share my knowledge here as well as find great information...and a nice community :)
Talk to you soon on the forum.
Tim