The size of the compressor depends on how much you need to spray at one time. If a person had only one of these little smudgepot compressors made for a nail gun they would never be able to spray the cast body of a tractor. It would soon drain the tank and you would have to stop and wait for the compressor to catch up. Then it would show a lap mark where you stopped and started again. I have a small 1 hp speedaire compressor that is only rated at 4.9 cfm at 100 psi. It will deliver enough air to paint any tractor. I've even used the compressor to paint a house with a pressure pot when my airless was down. I didn't have to stop very often to let it catch up.
I'm a fan of Harbor Freight but I would stay away from their compressors. I bought a 2 hp compressor item #67501 and within a couple of weeks the pump started coming apart internally. There was no fuss in exchanging the compressor but the replacement is just over a year old now and it's worn out. Of course I'm using it professionally but it was to replace the speedaire that is 25 years old. In all fairness the speedaire would have been 4 or 5 times the price of the harbor freight compressor though.
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