1.
If your guitar body is still attached to the neck, you will need to remove it. Remove the screws and carefully remove the neck plate and remove the neck. Also remove the touch guard and remove all electronics with it, including the jack and jack plate. Basically if it is not a part of the body it takes off.
2.
Now you need to remove the color already on the guitar. You can put this off by hand, or more easily with a belt or a palm. Start with coarse sandpaper until you reach the wood, gradually work your way up to about 200 grit sandpaper on the wood itself. Use a cloth to remove sawdust and paint dust. The second option is to use a paint separator and remove it chemically. You still need to sand the body afterwards to even out the grain.
3.
Go to a store that sells goods for painting cars, and buy aerosol-based primer. Spray it evenly on the guitar. Let it dry and repeat. After a few coats, you need to have a matte gray finish. The easiest way to apply primer is to hang the guitar body by running a wire through one of the holes left by disconnecting the neck. That way, you do not have to put it down.
4.
Next sand the primer with a high grip sandpaper. Do this with a light touch to smooth the surface, do not remove the primer.
5.
From the auto paint store, you can through spray paints that work well for a guitar. Make sure you do not start spraying or stop spraying on the guitar body. Apply at least 3 or 4 coats.
When the dye dries, apply 2 or 3 coats of varnish to seal the guitar and give it the right texture and shine. When this dries, replace the neck and the hardware.
Tips and warnings
Saturated guitar can make it like a whole new instrument. You can add your own specific feel, repair scratches or get a color that would not otherwise be available.
Source:danspela.com