What type of paint would you use to paint a nerfgun?

First of all I would not recommend painting a Nerf gun, I painted a $60 Nerf stampede and it doesn't work that well. However, if you are determined first get a krylon fusion for plastic can of spray paint, or multiple for more colors (krylon fusion is the most widely recommended paint for painting Nerf guns). Then take all the parts of your gun apart making sure to unscrew all the screws before attempting to take apart. Once apart sand it down so that the paint will stick then you simply pant your Nerf gun. If you wish to use more then one color spray paint the gun the the1st color then let it dry and then tape the parts off where you want that color to stay. Then you spray paint the remaining plastic (it's okay to get on the tape), then wait for it to dry then remove the tape and screw your gun back together.