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-   -   Fix sagging soft-top coming unstuck at rear (http://986forum.com/forums/diy-project-guides/71959-fix-sagging-soft-top-coming-unstuck-rear.html)

oldskool73 04-29-2018 10:34 AM

Fix sagging soft-top coming unstuck at rear
 
My car's a '97 but I fitted an '03 glass roof a year or two ago.

Recently I started to notice slight wrinkles at the rear corners of the top, and over time this has evolved to the point that the whole rear and glass has started to droop inwards, and the rear seams are showing higher than they should ...

http://986forum.com/forums/uploads02...1525020013.jpg

With the top in the service position you can see the problem, the rear canvas has pulled out of it's original folded position, allowing slack in the back part of the roof.

http://986forum.com/forums/uploads02...1525020389.jpg

I think this was caused, at least in part, by me over-tightening the hold down cables :(

Fixing this is pretty simple... we need to remove the rubber strip that holds the top in place, tighten and re-affix the top, then re-insert the rubber strip. The only new part we need is something to re-stick the top. I used the #03684 3M tape that's been mentioned on here a few times...

https://media.digikey.com/photos/3M%.../06384_sml.jpg

https://www.digikey.com/products/en/tapes-adhesives-materials/tape/908?k=06384%20TAPE

Start with the top in service position by pulling up the rubber strip from one side. Note the inserted part goes further than the visible part. I used a bent pick to get in under the corner and just carefully levered it out.

http://986forum.com/forums/uploads02...1525020981.jpg

... once it's started it just pulls out easily by hand. Continue pulling along the length of the rear...

http://986forum.com/forums/uploads02...1525021062.jpg

Once it's off, give it a good wash to remove 2 decades of grime, then a nice rubber protector to make it look sexy again...

http://986forum.com/forums/uploads02...1525021415.jpg

Here you can see the profile of the rubber, and how the inserted strip runs further than the bit you can see against the top. I coated all of the inserted piece with dish soap to make it easier to insert again later.

http://986forum.com/forums/uploads02...1525021556.jpg

oldskool73 04-29-2018 10:37 AM

Continued...


Now we can free the canvas from the old fixings. There's 3 attachments, 1 glued and 2 taped.

The glued section is a small flap of material that's inserted into the rear retainer and glues to the main canvas. Mine was completely unstuck. I'm not sure if this has any mechanical use in holding the top down, my guess is it's more a weather strip than anything else?

The main top is first taped to a flexible piece, then folds over it into the same channel that the rubber we removed runs in, and has another strip of tape holding it in place in there. The original tape seems thinner than the 3M stuff, more like simple sticky tape, but the extra width didn't seem to matter in putting it back together.

http://986forum.com/forums/uploads02...1525022149.jpg

Clean all the old tape of as best you can, and clean the whole area with IPA. Then run the 3M tape in the same places you removed the old stuff from. I also put some down to replace the glue, as it's all I had to hand, and there was just enough on the roll to do so...

http://986forum.com/forums/uploads02...1525022563.jpg

Now you just need to peel off the red backing tapes and carefully pull and stick the top back into the proper position (I followed the original fold creases as best I could). I did find the glass window to be a bit of a pain here, you might need to manoeuvre it around a bit to get the slack that the top needs to fit correctly. I'd imagine the plastic window would make this step easier.

The re-insert the rubber strip into the channel, making sure it's fully pressed into place. Just work your way back and forward pushing it into place,

http://986forum.com/forums/uploads02...1525023042.jpg

...and checking from underneath as well, as there's a small flap on the rubber that should slightly overlap the lower rim.

http://986forum.com/forums/uploads02...1525023393.jpg

...And that's it! Only took an hour or two to fix.

I gave it overnight with the top closed but unlatched for the tape to take, just in case. The final result... no more sagging... just needs a good clean now!

http://986forum.com/forums/uploads02...1525023231.jpg

CBRacerX 04-29-2018 05:18 PM

Outstanding post! Let it be example of how all DIY threads should be presented. A lot of the soft top stuff remains a mystery it’s great to see it deconstructed so that the layman can understand. Nothing to be afraid of if you have the knowledge.

grc0456 04-29-2018 05:44 PM

Great write up. I have the same problem, and attempted a ham-handed fix with fabric adhesive - basically just putting a bead of glue on the canvas and using a plastic pry tool to jam it back under the rubber. I got improvement, but not the professional type result you did.


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p3230 04-30-2018 07:14 AM

That's my project for this summer when the weather gets warmer thanks for taking the time to share it with us.

sdharmani 07-17-2018 04:02 PM

Is the tape sticking?
 
Hello OldSkool73,

Nice write-up!

Is the tape holding? Also, how did you pull the fabric so that it is stretched and tight?

I have the same issue - in my case the car has been baking in the sun from being parked outside during the day and the tape kind of melted.

I was able to successfully do the first part - which was removal and clean up of adhesive tape.

However, the second part was pretty poor outcome for me. Main challenges:
1. Tape doesn't seem to really want to stick to canvas. Did you use any tape primer?
2. The top cover interferes in re-installation of the fabric - did you remove it?
3. When doing myself, it is near impossible to stretch the fabric so the top is misaligned on one side (it's ok where i started, but short by 1" on the side I finished).

It much worse now than before I attempted the fix! Any suggestions / input is appreciated.

grc0456 07-17-2018 04:24 PM

Since my top and headliner had other issues as well (severe crease/wear marks, and headliner front lip separated) I decided to have the whole top replaced. Pretty happy with the result!

http://986forum.com/forums/uploads02...1531869818.jpg

oldskool73 07-17-2018 06:04 PM

hey @sdharmani

Mine's holding up well so far. The only thing I'd do differently maybe is use a proper canvas glue for the flap that's glued originally, as the tape doesn't seem to have worked there very well.

1. No, didn't use anything but the tape, with the top in service position I found there wasn't really any tension on it to pull it free of the tape anyway, and once you have the rubber in there that's gonna hold it in as well. TBH I think the rubber does most of the work, the tape just helps grip it in there.
2. Guess you mean the 'clamshell' part? Can't remember TBH, looking at the photos no, but it's really easy to do, just undo the 6 nuts underneath and lift it off, so if you think it'd help just do it.
3. Again with it in service position I didn't really have any tension on it, so didn't need to 'stretch' it at all. The only thing that made it difficult was the glass window moving around, so had to put a hand in from the back and push it into various positions to get the canvas to move around right.

Maybe you need to try putting the top a bit more 'open' or holding the bow a bit higher when adding the tape or something, to help relieve any tension on the canvas? I didn't have to 'stretch' it at all, it was more just fiddly getting it lined up and stuck neatly into the channel.

On the bright side, it's not too much of a hassle (other than the cost of the tape) to pull it out and try again until you're happy with it.

dghii 07-19-2018 03:47 PM

The 3M adhesive works better than the tape IMO. Folks are scared that they’ll make hey mess with the adhesive but if you spray it on a paper plate and then apply it top the top with a foam paintbrush it works pretty well and is easy to control.

p3230 07-20-2018 06:38 AM

I used a canvas epoxy that quick dries where the glue is and held it there for one hour with vise clips, and then I put the epoxy the rest of the way across where is say's glue on the top picture and then I pulled the top until it fitted in the bottom grove, then installed the rubber using a tool to install screens to set the rubber in place let it set overnight and the next day it was all good and still is.

constj 09-19-2019 06:27 PM

Not bad but may need to redo as you instructed
 
Nice post. I didn't originally understand all your instructions. I taped and glued mine, but didn't remove and re-tape the channel. Turned out well, but as you show in your picture, mine isn't all the way back as it should be. OK, for now, but I plan on redoing it if it sags again (which I expect it will). I now understand the channel re-tape and refit and how to know how far to pull the canvas back. Thanks.

BTW, I cleaned and protected my top with a 303 kit and it worked very well.


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