How can I fix aluminium corrosion on exterior side panel of 1996 swift baro?

The white powder is aluminium oxide. The aluminium skin has oxidized ( like iron rusts ). You have two options. 1: Use the same method as repairing a rotted car body panel by using a body filler and repainting, or 2: Replace the rotten panel. The first option is much cheaper but difficult to make an invisible job. My swift did this also. This means you probably have damp/rot inside the van wall. The wet has probably got under the metal skin and rotted from the inside out. The last moment is when you see the bubble break through.

Andy
July 2008