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  1. #1
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    New Car paint discolouration problem

    Quick update....I no longer live in Europe or drive a (black) TT, I've been through a Porsche Cayman R (black), replaced with a Cayenne (Black) and then replaced my wife's Macan with a 2019 MX-5 RF GT....this is where we are today. I love the car, just a gas to drive...but....I hated the big shark fin antenna on the trunk lid so I found on eBay a smaller, knob type antenna like all Porsches have, got it painted to match my car (Mechanic Grey Metallic) and easily enough removed the shark fin and installed the smaller part. Looks great EXCEPT that the paint under where the shark fin was and is now visible, is lighter - almost like a cloud, although the surface is smooth and glossy. I'm guessing damage from humidity when the paint was still new or simply an area of paint that did not oxidize like the rest of the car. The car has just under 2,300 km on it (1,429 miles) and has been a garage queen the whole time I've owned it from new....which eliminates any other causes. The shark fin did not have direct contact with the paint in that area since these parts sit on a perimeter gasket.

    Any thoughts on what it might be and what I might try to correct it? Could it correct itself? I have arsenal of Menzerna and other stuff ready to go...and time on my hands. The car will be hibernating under its cover for the winter in about two weeks or less.

  2. #2
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    Re: New Car paint discolouration problem

    Try to polishing it with the least aggressive Menzerna polish you have and a finishing pad. It's probebly oxidized rubber from the gasket that was between the shark fin antenna and the paint. That's a little hard to clean up. With a fine polish you will clean it up nicely I think. If you can remove the new antenna I would do so so you reach to clean the old stuff off. You can also try with an IPA or a panel prep wipe product which useally is effective on these kind of oxidized rubber stains. Just take your time and work from the outside of the stained spot and in to the hole of the antenna. So you don't spread this stain out on the clean paint. You can handpolishing it too if you want to and the same work from the outside and in. Start with cleaning it as good as possible. Use an APC and see what it takes you. Follow with an IPA or a panel prep wipe product or even a tar remover or mineral spirits a kind of a solvent to see if you are able to desolve most of it or all of it. Change regualar to a clean side of the mf towel you clean and soak up the cleaner you use. Also here when you clean work from the outside and in to the center of the stain. Maybe it's only needed to be cleaned this way or the light polishing will clean up the rest. Clean it up afterwards and put some protection product on it and done.

    Don't think since you have driven the car so little and garaged the rest. That the paints base coat color layer has been faded from the UV. So you would be seeing awesome results from it when you are done.

    / Tony

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  4. #3
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    Re: New Car paint discolouration problem

    Thanks Tony....I think you may have identified the problem. The Porsche part has only a thin gasket on the perimeter of the part whereas the Mazda part has a full rubber base (presumably because it is twice the size). I'm going to give your prescription a try. Again....thanks very much for your clearly expert advice.

    Tack sĺ mycket! (I used to work for SAS hotels)

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  6. #4
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    Re: New Car paint discolouration problem

    Varsĺgod! (You're welcome)

    Cool that you have worked at SAS Hotels! Have you been in Sweden for your job? In the little town I live in called Ronneby in Sweden. They have a big hotel and conferance center that has been owned by SAS if IIRC called Ronneby Brunn. But think that they have sold it but not sure.

    Tell us if it worked for you to clean it up this way. On newer vehicals it's useally no problems with doing it. And as always don't let any chemicals dry on the paint and you will be fine. With older paints you can have a big difference in the shade of the color of the paint when you take off like debadge or replace with something else that expose the before covered paint. The UV makes an impact on the base coat color layer over the years. Even if you maintain it great it's going to be some fading to the paint sadly. The less if you have it as a garage queen from the start.

    Hope it works for you and happy to help!

    / Tony

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