Step 1: Taking Off the Old Paint and the Sealer Layer
As you can probably see, I dont have an electric sander so I used a 150p sandpaper. It takes alot of time but the it worth it, and the wood remain complete and smooth.
You know when you sanded dip enough when you see the wood's color. Try not going too dip.
Step 2: Drawind on the Wood
After you finish you can thicken the outlines with a permanent marker like I did, or even paint the whole thing.
Step 3: Restoring the Sealer Layer
By using a maskentape you'll be able to do it easly.
Make sure that you are using a WATER BASED SEALER(!), otherwise the paint will get off while you spray.
Spray the guitar three times and let it dry for a few hours between each step.
Step 4: Finishing
Keep in mind:
the sound of the guitar will probably change after the renovating (mine's somehow Improved ;) )
1. About 3m of 150p sandpaper.
2. Water based sealer.
3. A pencil and a marker.
Good luck :)