Found this on AR15.com Credit to use Rabidus. Know what I am doing tomorrow night.
Much cheaper this way.
First is to get a poster board in the color of your choice, brighter the better.
(You can also get a white poster board and spray paint it a bright color, let it dry and put the tape over it too)
Then put 1 layer of glossy packing tape over it.
Then once your target is completely covered with clear packing tape, spray paint it flat black.
Spray a bright spot for your aiming point. This poster is 22"x26"
Target below is 300m .223 holes and I could easily see them with my spotting scope.