Published at Thursday, August 09th 2018, 12:48:22 PM by Dolly Walls. Air Compressor. An important factor is also the factor of oil. The oil is used for lubrication of moving parts of the compressor, but it also has some side effects. For example, traces of oil can be found in the tubes that deliver air to your airbrush tool, so it can be mixed with paint. This problem is more pronounced if the compressor is older. One possible solution is to purchase an oil free air compressor.