On Wed, May 12, 2010 at 2:52 AM, James V <chimivee@gmail.com> wrote:
> On Tue, May 11, 2010 at 3:40 PM, Scott Daniel - Turbovans
> <scottdaniel@turbovans.com> wrote:
>
>> I'd put window rust bubbles into two categories :
>> those that you can treat with window glass and seal in place,
>>
>> and those where you remove glass and seal.
>
> My experience would suggest otherwise: Once you see a bubble, you are
> seeing rust that originated beneath the seal in the base of the window
> channel and has crept outward, beyond the seal. So, any proper "window
> seal" rust treatment involves pulling the window.

Judging by the bubbles under my rear window I would claim that some of
this window seal rust originates from the inside. Moisture condenses
in upper area of free space inside the rear door (under the lower edge
of the window) and when You have rust on the outside visible it has
already gone through from the inside.

At least this is what I have in my rear door window seal: it is rusted
and has bubbles inside the door at lower window seal area. None
visible from the outside the van (or inside of the van). I have not
removed the window yet. After some years this would show up as rust
bubbles creeping from under the window seal.

Oh! and I did not have any plastic under the door panels to prevent
moisture in the van from going inside the doors and stuff. I live in a
region near siberia. It can be really cold up here sometimes. Those
plastics are really needed here.