Any idea what this is

Wow, I think you just inherited somebody else's mess. I think somebody damaged the clear and you made it worse inadvertently.
 
I tried to get the entire area to match but it's not doing anything.

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Maybe a stupid thought. But could it be possible that the car is coated with a protection that has a large darkening effect. And know on that part you are working on it has gone through the coating to the clearcoat. The thing to determind that would be to wet sanding or compounding a little bit outside of the part you have working on. Has the owner had the car since new? And if so may get you some information about what it has been done to it.

And nothing is on you if you have been upfront with the customer and not promised anything but to give it a shot. You wrote that you have been trying alot of different compounds. And hope you did not do it on the same spot. Is there any sign of this cracking and shifting in shades on any other part of the car?
 
It's the part between the tail lights that normally has the gt or pony logo
LSNAutoDetailing said:
Is that the rear plastic deck lid or the actual trunk. Your photos look like it’s the deck lid.


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Owned since new, just basic washes and stuff, nothing fancy. Came in to get a coating. On the entire car only this panel is effected
SWETM said:
Maybe a stupid thought. But could it be possible that the car is coated with a protection that has a large darkening effect. And know on that part you are working on it has gone through the coating to the clearcoat. The thing to determind that would be to wet sanding or compounding a little bit outside of the part you have working on. Has the owner had the car since new? And if so may get you some information about what it has been done to it.

And nothing is on you if you have been upfront with the customer and not promised anything but to give it a shot. You wrote that you have been trying alot of different compounds. And hope you did not do it on the same spot. Is there any sign of this cracking and shifting in shades on any other part of the car?
Click to expand...

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Cruzscarwash said:
It's the part between the tail lights that normally has the gt or pony logo

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You mean this?

7c6b77153c8331381ed60d9ed3bbfea8.jpg


You know that’s plastic right???

The deck lid is easily replaceable and there are a lot of better aftermarket choices. Honestly I wouldn’t waste anymore time on it because it’s plastic. It’s just a plastic cover...

As a matter of fact, a reputable aftermarket shop for mustangs carries replacements. What I wish Ford did, was not put a piece of plastic there but rather just left it sheet metal and painted, like the 05-09 mustangs.

2015-2018 Mustang Decklid Panels | AmericanMuscle



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I actually found that site last night and sent it to the client, they are gonna give me the old panel after so I can play with it some more
LSNAutoDetailing said:
You mean this?

7c6b77153c8331381ed60d9ed3bbfea8.jpg


You know that’s plastic right???

The deck lid is easily replaceable and there are a lot of better aftermarket choices. Honestly I wouldn’t waste anymore time on it because it’s plastic. It’s just a plastic cover...

As a matter of fact, a reputable aftermarket shop for mustangs carries replacements. What I wish Ford did, was not put a piece of plastic there but rather just left it sheet metal and painted, like the 05-09 mustangs.

2015-2018 Mustang Decklid Panels | AmericanMuscle



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Yes I've seen this before. Whatever top coating they're putting on this plastic rear decklid for these Mustangs is extremely fragile. Using just a black finishing pad with GG Perfecting Cream caused a large amount of these fractures to occur on a test spot. It was a great lesson for me and my neighbor working with his new GG6 polisher that sometimes the lightest pad/polish combo is not light enough! If these are coming out with sanding I'll have to give this a shot, looks like you're just going through this fragile top coat similar to the spent UV coating of faded headlights.
 
Cruzscarwash said:
I actually found that site last night and sent it to the client, they are gonna give me the old panel after so I can play with it some more

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Loach said:
Yes I've seen this before. Whatever top coating they're putting on this plastic rear decklid for these Mustangs is extremely fragile. Using just a black finishing pad with GG Perfecting Cream caused a large amount of these fractures to occur on a test spot. It was a great lesson for me and my neighbor working with his new GG6 polisher that sometimes the lightest pad/polish combo is not light enough! If these are coming out with sanding I'll have to give this a shot, looks like you're just going through this fragile top coat similar to the spent UV coating of faded headlights.
Click to expand...

For these back pieces, it's not about getting them spot free, as it is preparing them for a coating. I did a new car prep on my own 2016 Mustang:
LSN Auto Detailing - 2016 Mustang EB Prem PP - New Vehicle Prep

The idea is when it's new to quickly get some CarPro DLUX onto this panel. They scratch incredibility easy. As far as playing with it some more?? I think you'll have diminished returns considering it's plastic.. This rear piece is one of the more common items discussed on the Mustang Forums. Like I said, I wish Ford just left it off and designed the decklid like the 05-09.
 
One more thought on this if it's a 2016 Mustang, it's possible the car is still under warranty. The owner can take the car to the dealer and ask them to replace the rear deck lid. It should definitely not display what your seeing.
 
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