I have used the Wagner with Latex house paint on a plane and it was OK but I wouldn't try it with the KK. I use one of the cheap compressors used for roofing nail guns. It pumps up to 125 pounds. As soon as the tank is low and the compressor kicks on I quit spraying and wait for the tank to fill again. I have no trouble painting the base coat on a plane, it's when I have to mask and do all the trim work when my paint jobs start to go down hill. That's a lack of talent and has nothing to do with my equipment. My main guns are from Harbor Freight too. I found the 4 ounce HVLP gun to work the best for me. The small compressor even works with impact guns and most air tools, it just can't hold up with something like a die grinder. I'm also a stinker about tire pressure and they are great for airing up whenever the tires are low.