I can't see a problem using refrigeration compressors to be honest. I've seen the smaller airbrush compressors on Amazon, with the 3 litre air receivers. I expect they are fine for one, maybe two airbrushes at the same time. But they work exactly the same as the oilless compressor I removed from the unit I purchased. There less powerful in terms of watts and piston displacement. They maybe marginally quieter than the beast I removed from the unit I have. I'd have liked a Bambi 24 litre compressor, I just don't have the extra cash laying around at the moment. This idea is a compromise, but as best to the same as a Bambi compressor, just a homebrew version. I would have liked an oil site glass and oil filler port, but it's not a deal breaker. Any oil loss should end up in the airline trap. I don't expect there will be to much. Nothing mechanical last for ever, but hopefully I can get good service life from this diy variant airbrush compressor. If I can find this thread, once it's functional I will post a picture of it. Thank you for all the help and replys, much appreciated.