If you type fridge airbrush compressor into the search box on this site there is someone that has already done it.
Bambi compressors are the best and will last you a lifetime, literally ! You can get them cheap here
http://www.aircomps.co.uk/product-ca.../bambi-budget/
They're worth every penny.
Nio is correct about the airbrush too, Iwata are the dogs danglies but you don't need to buy the most expensive to do good RC bodies.