[T3] rust under the paint?

[fess <fess-vwtype3.org@fess.org>]

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My '67 square has developed small bubbles in the paint, on the drivers 
door.  can this be anything other than rust under the paint?  For 
instance can simple bad paint prep work do this?

the third picture on this page shows the bubbles:

  http://herbie.ddv.com/~fess/type3/issues/67_paint_job/

--fess

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