The Fixer

Mine were original and sealed in place. They were not coming out without breaking the glass. Now i can pop them in and out easily.

I never like spraying lube when i know painting will be done,

I don't see how any lube would loosen the factory applied sealant??

Anyway Andy,

It would be beneficial to the car to stabilize those bubbles because they will really accelerate the corrosion. They are trapping moisture.

It would be better to simply scrape the bubble off so air can dry it.

Temporary 1 day's work solution:

Pop the windows out (sounds like they were already out in past)

Carefully scrape off the bubbling paint

Use NAVAL JELLY to remove the rust,

Touch up brush in decent primer (2-part good stuff i mentioned, Krylon is crap)

Buy Porsche Touch Up Paint to hide the repair at 10 feet.

This will buy you a lot of time (years) til ready to tackle it right.

If you let this go you'll have pitting in the channel that will require a major effort.

Mongo

Woah that sounds easier to do now. At least it will buy me some time before sinking more money into the cosmetics.

I layered touch up and wet sanded it with real good results. I may try that.

Mongo

Yikes, naval jelly from what I read can dissolve paint too. Is there a less risky product for the dissolution in that area? What about something from Eastwood, like Rust Encapsulator or their dissolver? How about using a rust converter in addition to epoxy primer layered over it?

I also have a wire wheel I was planning on using to scrape the rust down. How about doing that and then applying a rust dissolver on the residual, followed by epoxy primer?

The Fixer

Naval jelly will not harm the paint around the bubble if it were to drip.

Mask the car in that area around your paint bubble if you are concerned.

Use a tiny coarse wire wheel on a dremel tool to prep pitted areas for Naval jelly.

Then use a toothbrush to really work the Naval jelly into the rust pitting.
Then allow to sit and chemically react for at least 10 minutes. Wire wheel and repeat with jelly, etc.

With a damp sponge remove used Naval jelly and repeat. I used to do it 3 times.

Metal should be now prepped with Xylene or Laquer thinner for painting.

With touch up brush paint in epoxy primer, allow 2 hours and touch up
with your Porsche red touch up.

Allow 24 hours minimum before re installing quarter window glass.

This fix will last until the baby is walking and talking, maybe even talking back.

dr bob

You need to strip the paint off before any rust converters. naval jellies, wire wheels, etc. can do anything serious about the rust. The window MUST come out so you can get to the important part of the job, the corroded window frame area.


Edit: ^^^ What he said. ^^^

Mongo

Simple enough. The PITA part is taking the glass out.

JHowell37

You can pry out 928 quarter windows with a crowbar and not break them. I've done it before. Several times. Successfully.

Hilton

I didn't even think to post your restoration when Andy asked what "horrific" would look like.

But I should have! Not everyone finds out their 928 has been repaired with 40lbs of bondo and drywall screws, and then goes on to fix it properly

M. Requin

If you haven't experienced the level of salt on the roads in Central NY you probably wouldn't believe it, and what it does to cars. The location of the western hemisphere's deepest salt mine, right north of Ithaca, explains why they use so much - it's cheap! (Ithaca/Trumansburg for 30 years before getting smart enough to move back to VA.) Makes any car person who has lived around there very paranoid about corrosion on their vehicles.

kawi825

As a fellow Rochesterian Rustbelter, I agree, gotta take the glass out, mine poked perfect until we got em out them saw lots of bubbles in there. Have to expect it in a place that goes from 85 and humid to 5 deg within a month or two. Martin , you were smart to go!!!

M. Requin

Matt- looks like your paint job is coming along. Post some pics when it's all done!