: Bubble under vinyl top



YoshiMan
05-28-13, 01:13 PM
How are you guys?

I noticed when i first bought my 75' CDV last year that there was a slight bubble under the vinyl top in the dead center of the top of the roof. The car is garaged all the time and never is exposed to the elements, but I'm pretty sure that it probably rust forming under there, and if so, its only 1 of two places where it is:

http://i208.photobucket.com/albums/bb220/YoshiMan38/G-Ride/2013-05-28_10-53-04_312_zps59013038.jpg (http://s208.photobucket.com/user/YoshiMan38/media/G-Ride/2013-05-28_10-53-04_312_zps59013038.jpg.html)

http://i208.photobucket.com/albums/bb220/YoshiMan38/G-Ride/2013-05-28_10-54-17_616_zpsfe1820dd.jpg (http://s208.photobucket.com/user/YoshiMan38/media/G-Ride/2013-05-28_10-54-17_616_zpsfe1820dd.jpg.html)

I considered replacing the whole thing and fixing both it, and the other small spot just below the top on the drivers side, but its still in very good shape and it seems that would be a waste to tear off the whole thing just for two small problem areas:

http://i208.photobucket.com/albums/bb220/YoshiMan38/G-Ride/2013-05-28_10-51-27_576_zps6b6103e2.jpg (http://s208.photobucket.com/user/YoshiMan38/media/G-Ride/2013-05-28_10-51-27_576_zps6b6103e2.jpg.html)

Anyone been able to fix just a small spot like that without having to replace the whole top? i imagine it requires a hole to be cut in the vinyl to clean up the rust, and then to epoxy it back down, and since its in a hard place to see, i don;t imagine it would be noticeable.. Perhaps upholstery shops are capable of doing a little repair like this? Thanks in advance, any tips are appreciated :thumbsup:

outsider
05-28-13, 02:56 PM
never heard of anyone replacing only a small part of the top like that...good luck to you! Let us know anything you can find out.

MoistCabbage
05-28-13, 05:06 PM
The top's going to have to be removed to repair the metal anyway. If you cut a section of the roof out just over the bubble, you'd have to keep cutting until you were past the area of corrosion, plus room to do the repair. There's most likely rust starting in other places anyway. Even if you got lucky, and cut out one piece, and left room to repair the metal, there's really no way to sew the piece back on without removing the whole top. Water would be able to get through the seem, and it would look horrible anyway.

jayoldschool
05-28-13, 05:14 PM
By pushing on it, you'll be able to tell immediately if it is rust, or simply a bubble where the top (or foam) has lost adhesion.

YoshiMan
05-28-13, 06:15 PM
Hmmm, i haven't tried poking it yet, maybe it did just come undone... i'll take a look at that when i get home. the top may be on the list of thing to do if it is starting to corrode, i wouldn't be surprised if there was more hiding out underneith!

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The bubble doesn't have much of any give in it, and some parts of it make a slight crunchy sound, so its definetely rust... and I haaaaaaaate rust... it's probably just the surface of the metal though, because it still feels rock solid

HartfordGuy
05-28-13, 06:33 PM
If the top is in good shape it probably can be reused. But it will need to be pulled off and the rust fixed. Plus that rust under the side molding edge isn't going to get better either. It will eventually leave rusty brown dribble on the side of the car. Gotta fix that before it runs amuck. Look at your bodyside moldings closely too. Those are another rust prone area where the clips are.

SafariOne
05-28-13, 06:37 PM
If you want to just get by for now, take a hypodermic needle and poke it through the vinyl and that will get the air out. If you want to restick it you can introduce a a vinyl adhesive into the syringe and inject a small amount. Put some weight on the area until it sets and you should be good for a while. You can put a tiny spot of crazy glue on the needle hole to keep moisture out.

talismandave
05-28-13, 06:59 PM
If you want to just get by for now, take a hypodermic needle and poke it through the vinyl and that will get the air out. If you want to restick it you can introduce a a vinyl adhesive into the syringe and inject a small amount. Put some weight on the area until it sets and you should be good for a while. You can put a tiny spot of crazy glue on the needle hole to keep moisture out.

It doesn't sound like air....it sounds like the top is solidly on top of rust flakes. Now a needle filled with a rust converter....:hmm:
That might buy you time, but won't look any better.

cadillac_al
05-28-13, 10:31 PM
I think if a piece as large as a softball rusted clean through, it could be patched and smoothed so it would be un-noticeable under a new vinyl top. I wouldn't fix it until the top started cracking, unless the rust bulge was really annoying to look at. I have a couple rust bubbles under my vinyl top that have been there for 5-6 years. They haven't gotten any bigger and they aren't that noticeable. My top is finally cracking after 30+ years and I hope to replace it next year and patch those rust bubbles.

YoshiMan
05-29-13, 05:51 PM
thanks for the suggestions guys! I may talk to a few upholstry shops, as i have seen them work wonders on some things of mine over the years, perhaps they have dealt with thing like this as well? In the mean time i just may try the needle thing.. It's funny how there is not a single spec of rust on the frame or the undercairage, and the only two places (at least that i have found it) are very blantantly obvious. In fact, my 2003 Escalade has more underbody surface corrosion that this car does... hmmm..

brougham
05-29-13, 09:21 PM
Since you said the car isn't exposed to the elements just leave it until it gets worse. If you want to get it fixed get the roof redone at the same time. Old vinyl doesn't hold up too well to being pulled around and chances are it'll end up looking worse then that bubbling does now.

YoshiMan
05-30-13, 08:34 PM
That is true, i keep her in the garage and usually only drive it at night when its nice out.