Using the right kind of brush for painting is important. If you’re going to paint your house with any kind of paint, it is much better using a synthetic kind of bristles of a brush. Because if you’re using a natural one, it will easily break or soften its bristles when it wet. Choose a polyester bristle is the best, because it is consistent even when it’s wet and it can maintain it shape as you use it. Good painting can also depend on the size of brush. For average room you can use 4” brush with a 1 ½ “ straight edge brush for sashes and and 2 “ brush for trim. There are many budget kind of brush but don’t skimp your brush because it will produce poor performance and it will manifest on its result.