concrete color paint?

I guess you could call me an expert on concrete, at least I have several certifications pertaining to it any and I have seen probally a million yds or so of it poured. In my opinion just about any shade of gray could work. The colors vary depending on the mix,the company, the truck, and alot of other things. Just remember that an exterior surface will not be perfectly smooth but would most likely be a brush finish.

Just had excellent results with Model Master Enamel. Started with base coat of light sea gray FS36307 then applied camouflage gray FS 36622. After this had dried used Earth Tone pastel chalks to highlite and weather. Was more than happy with the final outcome. Hope this helps

Polly Scale also makes a "Concreet" more grey less tan.

Polly Scale makes an "Old Concrete"

I start with a dark gray base color, and drybrush with lighter coats of gray to simulate concrete. I then add tan and dirty black washes. Then drybrush with white for highlights and my concrete is done!

Regards, Dan