When it comes to painting the inside of your house, there are a few ways to go about it. The two most popular painting methods are using a spray gun and using rollers. This article compares the two processes so you can decide which is best for your home. As you'll see, it often depends on the size of your home, and a few other factors. Spray Guns First of all, when it comes to actually getting paint on your walls, a spray gun is quicker.