Yes, you can. However, you should use the right type of spray paint for canvas to make sure that it's durable and will not be damaged when you remove the paint. You can use Krylon or Rust-Oleum spray paint, both of which are affordable. You should also make sure that you're using acrylic paint since other kinds of paint will not stick. Lastly, make sure that the area that you're spraying is well ventilated. The paint will be hot when it comes to paint and you don't want to inhale any fumes.