The tank on your air compressor ought to be drained periodically to remove water and contaminants, but that is not enough. If you are spraying paint and want the finish to be flawless, you need an air dryer and filter in your system. We carry dryers and filters big enough for your whole shop and even little ones to use between your portable compressor and paint gun. Water separator/dryers aren't just for spray guns either, many air tools will work better and last longer if you avoid condensation and the corrosion it can cause inside of them. Whatever your need, requirement, and budget you can count on finding the right equipment at an affordable price at Rite Products.