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Re: Vel Satis bubbling - is this what they'll become known for?
Traditional rust treatments won't work with aluminium, and tbh, any traces of aluminium oxide just needs sanding out before painting.
Aluminium corrodes in a cosmetic rather than a structural way (like steel/iron), as the aluminium is exposed to air & water, the oxide is formed which then becomes inert and won't corrode any further into the metal. However, it does have the effect of weakening the paint, which, when exposed to the elements, will fall away, thereby exposing more fresh metal to react.
Steel/iron would do the same, but would continue to react through the panel's thickness if left unchecked.
Personally, I wouldn't hold out much hope for a warranty claim being successful, if the car was 2-3 years old - then there's more chance of claiming a flaw present from manufacture, but its worth pursuing, so long as you adopt the 'nothing to lose' mentality.
P.S. the simplest way to check what the door's made from is by using a magnet - if it doesn't attract, its not steel.
This job should never be complete - the day I think I've done it all, is the day I resign.
Currently in VelSatisfied's garage:
2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater