These guys are right!! I kill a lot of called and decoyed crows,and the only finish for dekes is flocking!! So flock them [beeep] decoys!!
Its not as hard as you think,I take a box about 18" square and duck tape the seams nicely,you paint your decoy with the flat black paint over another box letting it drip in the paint box,then tap it a bit.Hold it over the flocking box and sprinkle the flocking on it tapping the nose so the excess falls into the box,keep spinning the deke and sprinkle it on,then tap it more.
When done hang them on hooks to dry. Your taped up flock box will alow you to gather up all the excess flocking material, put it in the bag and use it for the next time.
I buy mine from Crow Mart on Crow Busters,they say the kit flocks (8) decoys I can do triple that with a kit,it lasts about three years till you have to do it again,if you keep them in good decoy bags.
And yes you can buy the paint at he local store,its flat black,but do not thin it,the thicker the better.
But for all the trouble just buy the kit,you will be happy how your dekes look,believe me,when the sun is low you wont get that crappy sheen from the plastic,and on those real cold winter mornings you wont get the frosted look as much.
http://www.crowmart.com/