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Super Member
Re: Clear Coat Failure or Chemical
Did you take any pictures?
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Re: Clear Coat Failure or Chemical
Yes. Just now pushed up.
Sent from my iPhone using Tapatalk
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Super Member
Re: Clear Coat Failure or Chemical
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Re: Clear Coat Failure or Chemical
Thanks for adding to the discussion! Unfortunately the iPhone photos do not give the best up close details that appear to our vision.
Although the owner states this happened sometime during the past year they never had the car near a body shop. Which is strange to me as I examine the right side after doing the polish. I can see what appears as a paint line where perhaps it is a bit thicker or a layer. Paint still has imbedded defects below the surface and with side lighting it looks to be swirls but those could have been a poor sanding of the color coat?
I do think you might be on the path of the problem but can these painting errors take time to manifest them months after the repaint?
So the mystery still eludes me but glad the process improved the appearance.
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Re: Clear Coat Failure or Chemical
Just to chime in,
Hope you don't mind but I downloaded your pictures, rotated a couple of them and then resized and uploaded to your gallery here,
Thomkirby Gallery - AutogeekOnline Gallery
This enabled me to insert the photos into your original post so "I think" they now look correct?
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Re: Clear Coat Failure or Chemical
Originally Posted by
Hirohito
It's called gloss dye back, it generally happens after a repaint,
I went to Skynet and typed in,
gloss dye back
And the first search result was a discussion on a forum for the SPI or Southern Polyrethans Inc paint manufacturer. To be honest, I've never heard of this brand of automotive paint.
Dye back
Here's the question,
Originally Posted by
cjetmech
I hope this is the right spot to ask this question. I hear alot of people mentioning dye back, what is this? And why does it happen? A pic would be great if anyone has one. Thanks for answering my newb questions I appreciate it.
Here's a staff member's answer. I've taken the liberty to format it a tick to make it easier to read.
Originally Posted by
Barry
Great question!
Of course the answer really depends on the product and brand.
A: Some clears do not like being reduced and that can cause die-back.
B: SPI does not care about reducer as long as a good grade, low grades can and will kill the clear.
C: Some clears can cause their own die-back if flash times are not long enough because of the low amount of solids. Not the SPI.
SPI clears can die-back from the following:
- Abuse of polar accelerator.
- Using a crap reducer.
- Baking to hot or to long.
- Leaving the booth fan running to long.
Now the above should give you a general idea to why and the differences in clears.
Now the truth, of all the calls I get for die-back, it is 99% of the time, from the base coat solvents.
So according to Barry, from his experience, the major culprit in Dye Back are the solvents used to reduced the basecoat or the color coat.
There you go...
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Re: Clear Coat Failure or Chemical
Originally Posted by
Thomkirby
I was recently asked to look at a paint problem for a potential customer.
They showed me the car but could not tell me any clues as to why this rear trunk top surface looked so bad.
Photo-1
Maybe you did this already?
I would have asked them,
Did you buy the car new? If so, did you get the trunk lid repainted?
If they say they bought the car used? Then ask them if the previous owner shared any collision work that had been done?
There's a ROOT CAUSE for one panel out of the entire car to fade like shown in the picture above and my guess is the panel was re-painted and then neglected. A simple quality buff and seal after the paint cured would have and could have probably refined the final cured paint and sealed and protected it from further degradation.
Most people don't take care of their cars be they new or used.
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Re: Clear Coat Failure or Chemical
Also...
Anytime any of us are looking at some kind of paint defect and it's ONLY on a horizontal surface, that's a huge indicator of what the root cause could be.
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