Uh oh, something is amiss here! While is primer is not always required for most surfaces with Rust-Oleum Chalked Ultra Matte Paint, it is recommended for use on bare or treated wood. This helps with coverage since wood is such a porous surface and it will soak up more paint. Next time, start with Rust-Oleum Painter’s Touch Primer!
http://www.homedepot.com/s/painters%2520touch%2520primer?NCNI-5