I used a couple coats of brown latex paint. After that dried I put some watered down brown paint and streaked it. Then I put down various globs of brown paint with a little bit of black added. Once the globs were semi-dry, I moved them around a little to make knots in the wood. Finally, I just dipped the head of a nail into some black paint and pressed it against the board where I wanted old rusted nails. Hope this helps!