Using the spray mechanism found in standard spray cans and some common discarded items you can make your own spray paint. This project uses a bicycle pump to pressurize a small PET pop bottle, and by varying the amount of pressure you pumped into the 'can' and the types of paint added you can produce different effects. The style I got based on the paints I used and the pressure applied is reminiscent of a graffiti mop style.
Enough talk, let's make our own spray paint!
*Inspiration for this project was drawn from the short movie splay
Step 1: Tools + materials
Step 2: Old spray can
Once all the pressurized air has escaped, place the can in a vise and saw around the neck of the can. This will separate the can into the lower housing and the upper nozzle. Keep the upper nozzle and tip out the glass marble found inside the can housing, you can discard the can housing after.