With age window seals shrink and allow capillary action to wick and
hold water.  Pull the window with seal, treat or repair rust, replace
seal.

2010/5/12, Janne Ruohomäki <janne.ruohomaki@gmail.com>:
> 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.
>

-- 
Chris S.
"No solution is too complex to be executed incorrectly"