Spray Painting a fake gun

Today my aim was to get a fake bb gun which I own, spray painted. This is because its original colour was neon blue. Luckily one of my teachers had a mat black spray paint that I used. This is one of the major props that are needed in our film trailer. We are stilling going to use more guns if possible. However the other gun belongs to one of my other teachers in school, and we will be supervised while using then to film.