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      06-21-2019, 12:34 PM   #45
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Quote:
Originally Posted by lE92l View Post
I had the same thing happen to my 2009 E92 M3. This thread helped guide me on what to do. THANKS TO THE OP

Unfortunately it sits outside for most of its life. I had it under bmw car cover, xpel clear bra on roof, and ceramic coating on xpel. Still with all that the gel coat failed. The good news is I was able to save it. I think my saving grace was the xpel. The clear started to bubble under the xpel. When I started to peal off the xpel the gel coat came off with it.

I got lucky and literally all of the gel coat came off with the xpel. Just came out like in sheets.

I then had a body shop just spray clear over it with the OPs instructions
Question - it looks like there was still splotchy yellowing on the carbon fiber after you removed the gel coat. How did the shop prep the carbon fiber to be cleared over? Did they just clean it with water and a mild detergent? Or did they do some polishing and/or wet sanding?
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      06-30-2019, 10:13 AM   #46
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Originally Posted by CHE///MIST3 View Post
Awesome efforts with great results! I am amazed at how the layers just come off like that. when the gel-coat/clearcoat came off, did that take off most of the yellowness with it? I would have thought that most of the yellow would be embedded between the weaves of the carbon fabric, but from the looks of the layers you pulled off, its mostly in the clear coat/gel coat.

GM
Thanks!

Actually all the yellowness was the clear/gel coat itself. As it peeled off all of the yellowness came with it. What you see still on CF is just like a powder residue from the gel coat. That can just be cleaned off.

From the looks of it the carbon fiber was completely unharmed. Now that it has actual clear and not gel coat should last longer too.

I am still debating wether to do Xpel clear bra again but for now just coating it with CarPro Reload once a month. Plus its under bmw cover.
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      06-30-2019, 10:19 AM   #47
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Quote:
Originally Posted by M3MPH1S View Post
Quote:
Originally Posted by lE92l View Post
I had the same thing happen to my 2009 E92 M3. This thread helped guide me on what to do. THANKS TO THE OP

Unfortunately it sits outside for most of its life. I had it under bmw car cover, xpel clear bra on roof, and ceramic coating on xpel. Still with all that the gel coat failed. The good news is I was able to save it. I think my saving grace was the xpel. The clear started to bubble under the xpel. When I started to peal off the xpel the gel coat came off with it.

I got lucky and literally all of the gel coat came off with the xpel. Just came out like in sheets.

I then had a body shop just spray clear over it with the OPs instructions
Question - it looks like there was still splotchy yellowing on the carbon fiber after you removed the gel coat. How did the shop prep the carbon fiber to be cleared over? Did they just clean it with water and a mild detergent? Or did they do some polishing and/or wet sanding?
What was left was like a powder residue from the gel coat. Not sure what they used to remove it completely but little I took off was coming off with just water.

I would imagine just some grease/wax cleaner used for normal painting prep.

I know for the actual clear application there was I believe two coats then wet sand, two more coats then wet sand. Just like the OP explained. Not sure the total number of coats.
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      07-07-2019, 07:20 AM   #48
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Well the inevitable happened to me yesterday. All started with a little bubble on the front, over the windshield which I didn't even notice.
Went to the car wash and the pressure washer did it's job. And from then on, things escalated quickly. It peeled like it was hardly attached to the roof...
Under it, there was a ton of yellow dust formed by the gel coat.

I'll finish it of with a razor blade for the tough parts and it goes for a clear coat this week. Will keep you updated!

P.S. Here is also a little video of the peeling process. I just used a plastic(credit card) for the job.
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      07-07-2019, 08:25 AM   #49
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Quote:
Originally Posted by Alexand3r View Post
Well the inevitable happened to me yesterday. All started with a little bubble on the front, over the windshield which I didn't even notice.
Went to the car wash and the pressure washer did it's job. And from then on, things escalated quickly. It peeled like it was hardly attached to the roof...
Under it, there was a ton of yellow dust formed by the gel coat.

I'll finish it of with a razor blade for the tough parts and it goes for a clear coat this week. Will keep you updated!

P.S. Here is also a little video of the peeling process. I just used a plastic(credit card) for the job.
This is the stuff of nightmares.
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      07-11-2019, 02:50 PM   #50
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Looking forward to the results ! It's nice that most of what actually turned yellow is gone....the clearcoat applied over the carbon laminate will enhance the blackness of the carbon weave.

GM
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      07-11-2019, 03:25 PM   #51
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Quote:
Originally Posted by CHE///MIST3 View Post
Looking forward to the results ! It's nice that most of what actually turned yellow is gone....the clearcoat applied over the carbon laminate will enhance the blackness of the carbon weave.

GM
Yes, I definitely think that the yellow coloring will disappear now. It was all in the form of dust underneath and in the gel coat itself.
It's in the shop right now for the new clear coat. Will post results in the following days.
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      07-17-2019, 10:37 AM   #52
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Sorry for the delay! This is the result. MUCH better than before. The carbon fiber weave pops up much better and is more defined, also the yellowish colour is gone. Really happy with the result. So don't be scared when/if that happens to you, because it's for better.
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      07-17-2019, 03:50 PM   #53
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That looks phenomenal. There appears to be plenty of depth. Can you describe approximately what they did? Number of coats, sanding in between, etc ?

Enjoy the new roof!
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      07-18-2019, 02:04 PM   #54
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As far as I know 3, but I'm not entirely sure about that.
I just know that the first layer just soaked into the carbon fiber and merely left any on the surface. I think they sanded the second one and then put the final layer. Again, not 100% sure, but I at maximum there is a fourth one.
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