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 Shrinking rear window molding.

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carguy8888
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PostSubject: Shrinking rear window molding.   Fri Mar 01, 2019 7:02 pm

My car sat outside for a long time and has a couple of euge gaps after the rear window molding shrunk. Is this a common problem with these cars. I'm pretty sure water is leaking into my trunk through here.
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albertj
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PostSubject: Re: Shrinking rear window molding.   Fri Mar 01, 2019 8:42 pm

Yes the moulding shrinks over time. You can slow down the shrink with moulding dressing (silicone) but it will still shrink, mine have shrunk too just not as much. The trunk leak would not really come from there, the window is sealed under the glass with urethane. The leak rather would come from the weird body panel fit at the trunk hinges.

Caulking/bridging that moulding gap won' hurt but it will not fix your trunk leak.
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carguy8888
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PostSubject: Re: Shrinking rear window molding.   Fri Mar 01, 2019 9:09 pm

I just had a body guy replace the seam sealer on the quarters two weeks ago. Thanks for the heads up that its not the glass. This leak is a pain in the ass.
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albertj
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PostSubject: Re: Shrinking rear window molding.   Sat Mar 02, 2019 5:52 pm

carguy8888 wrote:
I just had a body guy replace the seam sealer on the quarters two weeks ago. Thanks for the heads up that its not the glass. This leak is a pain in the ass.

Seam sealer won't be enough, especially if Body Guy missed the seam that runs along the top of the rear fenders, and if the trunk hingle landingsare not cleaned and welded or epoxied. .  Look at the area upwards from the trunk floor and you'll see the areas of interest, most likely they will have mild corrosion at the edges.
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carguy8888
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PostSubject: Re: Shrinking rear window molding.   Sat Mar 02, 2019 7:42 pm

Yes, it was cracked by the hinges. I can take some pics tomorrow. My plan was to get in the trunk and video where I think it is coming in. Everything is out of the trunk including the mat and the spare tire.
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albertj
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PostSubject: Re: Shrinking rear window molding.   Sat Mar 02, 2019 9:10 pm

carguy8888 wrote:
Yes, it was cracked by the hinges. I can take some pics tomorrow. My plan was to get in the trunk and video where I think it is coming in. Everything is out of the trunk including the mat and the spare tire.

There is a seam along the top of the rear fender just above the plane of the gutter around the trunk opening. Be sure to check that.

Most likely stopping the water involves removing the trunk and repairing the area where the hinges are secured, as well as getting at those seams. On my car I had the trunk removed and had new metal welded in to hold the trunk hinges.

One almost wonders if the Riv was intended to be a fiberglass or polymer shell. And one wonders about a Riv factory convertible.
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carguy8888
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PostSubject: Re: Shrinking rear window molding.   Sat Mar 02, 2019 9:37 pm

I'll post pictures tomorrow of what we did.
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carguy8888
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PostSubject: Re: Shrinking rear window molding.   Sat Mar 02, 2019 9:39 pm

I'll snap some pictures tomorrow when I take the car out and you guys can see what we did. Thanks for the good advice of this board I would have thought it was the rear window but the exterior molding isjust cosmetic apparently.
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albertj
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PostSubject: Re: Shrinking rear window molding.   Sun Mar 03, 2019 10:05 pm

carguy8888 wrote:
I'll snap some pictures tomorrow when I take the car out and you guys can see what we did. Thanks for the good advice of this board I would have thought it was the rear window but the exterior molding isjust cosmetic apparently.


Right.  You do want the rear moulding contiguous because you do not want water/silt/salt accumulating in the cavity, but there's just no communication to the trunk cavity from there.

Consider making sure it is cleaned out (blow out with air after a wash) then fill the gap with black silicone and shape it with a wet Popsicle stick...


Last edited by albertj on Sun Mar 03, 2019 10:08 pm; edited 1 time in total
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carguy8888
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PostSubject: Re: Shrinking rear window molding.   Sun Mar 03, 2019 10:07 pm

Damn, you just reminded me I forgot to take the picture LOL. But apparently I have some more work to do.
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nickwon
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PostSubject: Re: Shrinking rear window molding.   Yesterday at 10:13 pm

albertj wrote:
Yes the moulding shrinks over time.  You can slow down the shrink with moulding dressing (silicone) but it will still shrink, mine have shrunk too just not as much.  The trunk leak would not really come from there, the window is sealed under the glass with urethane.  The leak rather would come from the weird body panel fit at the trunk hinges.  

Caulking/bridging that moulding gap won' hurt but it will not fix your trunk leak.


I use 303 protectant. I like this product since it offers UV protection.
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albertj
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PostSubject: Re: Shrinking rear window molding.   Yesterday at 10:57 pm

nickwon wrote:
albertj wrote:
Yes the moulding shrinks over time.  You can slow down the shrink with moulding dressing (silicone) but it will still shrink, mine have shrunk too just not as much.  The trunk leak would not really come from there, the window is sealed under the glass with urethane.  The leak rather would come from the weird body panel fit at the trunk hinges.  

Caulking/bridging that moulding gap won' hurt but it will not fix your trunk leak.


I use 303 protectant. I like this product since it offers UV protection.

I use 303 also and it is **great** stuff. Moulding still shrinks.
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