If you need to paint the screw heads you can do it without making a mess. If you try to hold them in your fingers and paint them you will get paint all over your fingers. Now you don't have to do that. Take a plastic shopping bag and cut the bottom off of it. Take that bottom piece of bag and stretch it over a can like a drum. Tape the bag tightly to the can so that the bag is stretched tight. Take the screws and screw them into the plastic on top of the can so that they are standing up. Now they are in the perfect position to be spray-painted.