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One warning that has not shown up yet is the noise factor. The diaphragm type (oil-less)compressors make a whole lot of it. Piston compressors are much more pleasent to be around if working continuosly for a long time. i.e. painting.
Paint gun will require much air even the HVLP. I pained a couple of panels on my daughter's car and my Sears 5 hp 26 gallon compressor kept up, but ran almost continuously. Don't forget the annoying noise I was telling you about.
Other factor is piston compressors will replenish the tank much quicker than the oil-less. I wish I had held out and bought the Ingersol Rand piston compressor. It was a few $ more for the same physical size, but I believe it would have been worth it. Get the largest tank that you feel you can donate space to.
Now the downside of the piston copressor. If you intend to paint, you should have larger and more effective filters. This will not be included in the basic purchase price of either compressor and will be an additional cost. Using the oil-less compressor, I was able to get by with just a water trap. Did I mention that the damn thing makes a lot of noise.
After I painted the car, I was using a DA sander with buffing pad and had the garage door open. My neighbor across the street was out doing some gardening and mentioned how he was getting tired of the noise. Something to consider in your decision making process. A friend warned me about the noise and I underestimated how loud and annoying it can be. Consider yourself warned.
Dan
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