Painting aluminium

so I got a bunch of old Macbooks lying around; they can be had in the $20 region locally in varied states of decay. fixing them up is cheap and easy, so it's an inexpensive hobby with potential resale upsides. so it occured to me it'd be fun if I could paint them; cheaply of course, can't outsource this to professionals.

tried searching for successful projects but came up short. I believe the main hurdles were:

• expensive devices, nobody wants to risk fucking them up - not an issue any more
• you kinda hafta disassemble them as paint can fuck up a bunch of stuff - not a problem for me
• something about aluminium not taking regular spraycans and such - might be misremembering this

this is kinda what I had in mind:

you got any pointers on what and how?