Yes, you can paint your dead grass, but there are a few things you need to know. Firstly, you will need to use a roller, because the paint will soak into the grass much better this way. Secondly, you must water well after the painting, let it dry and then water again. If you don’t water well, the paint will flake off. And lastly, you should wait until the weather is warm enough, so the paint will dry up quicker.