Here's a guide to how I airbrush and finish foam popper heads. this technique can be used with any commercially available foam head or body.
I use the Copic system as its quick and easy you can get an airbrush here http://amzn.to/2nlWKAS I recommend getting the set with the adapter.
This matches with the original style copic markers (the square ones) which you can find here http://amzn.to/2Bzx5tv
For compressors I use a mini airbrush compressor like nail salons use, like the ones listed here http://amzn.to/2Elf1GA