If you are going to restore an old Vanagon you might consider a complete paint stripping and chemical dip for rust. This kind of full restoration is very involved, but the results are amazing. Surface Processing Ltd (SPL) of the UK does full chemical dips for rust and has a variety of cars on its website. Don’t you wish your van’s body could start like this?

The SPL website touts their process:

The SPL system will effectively remove the paint, grease, oil, underseal, filler, anti-flutter, adhesives and the majority of all rust from Panels, Parts and complete body shells. The process is carried out via chemical immersion and so avoids the problems encountered with all types of blasting.