It has primer in it too, so I didn't have to worry about that step. (realitydaydream.com)
Most spray paints have primer in them already so I would look for a can that says Paint + Primer on it. (inmyownstyle.com)
When I went to sand, I got the soft finish I would get with AS chalk paint, but there were little white flecks that showed up all over my chairs: (After reading your post, I realized my paint does have primer in it as well. (inmyownstyle.com)