Per,
You can strip with an abrasive, but the safest way to go is with good old airplane stripper (available at your paint shop). It is messy, but it takes the paint off really effectively. It also leaves the OEM zinc finish on the panels if you are careful when you get the the metal stage. After stripping, clean with thinner and recoat immediately with Oxi-Solve from Eastwood. This will add a good zinc coat to any bare exposed metal that you have. The zinc coating also promotes adhesion as well as providing extra rust prevention.
Here is a picture of my Ralley hood that we stripped with airplane stripper and then coated with Oxi-Solve. Followed up with PPG epoxy primer to seal the metal.
Daniel