2008 E87 118d - Black High Gloss window shadowline. Rainbowing issues.

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Thread: 2008 E87 118d - Black High Gloss window shadowline. Rainbowing issues.

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  1. 2008 E87 118d - Black High Gloss window shadowline. Rainbowing issues. 
    #1
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    bigmondy's Car Details
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    What is the best advice you would give for a really severe case that even the dealer couldnt sort.

    Spoils the appearance and the car is only 3 years old.

    I read in another forum that this was good:



    Clearkote Vanilla Moose Wax Hand Glaze

    The detailing handbook on the sticky doesnt really deal with this issue in any great depth. It is really common on BMW's though.




    Quote Originally Posted by Extract from a BMW technical service bulletin that I found
    The glossy black trim pieces are anodized, not painted, and the discoloration does not mean that the surface has been damaged. Exterior trim may become discoloured; this discolouration is due to a film deposited on the trim which distorts the light reflecting off the trim.

    These deposits may come from car washes, hard water, or other environmental conditions. Deposits that cause the discoloration can be easily removed by polishing with a quality light finishing polish.

    After washing surface use Klasse all in one (AIO) (for water spots use with a terry weave towel to increase abrasiveness)
    Gives me a little hope you can cure it.
     
     

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    TheEnd's Car Details
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    I would avoid that glaze and go for a polish instead.
    Waxes and glazes fill the low spots, polishes remove the high spots.

    To me, it sounds like they are describing Dichromatism, where thin films make a difference to the colour similar to oil on water.
     
     

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    bigmondy (07-08-2011)

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    #3
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    It is almost ingrained in the trim.

    The other high gloss elements round the base of the side mirrors are still really bright and glossy - it is just the trim round the windows (the shadowline).

    It really is horrible oxidisation and it looks so dull that it is hard to imagine it ever brightening up. :(

    I read in another forum that regular treatment - every 3 months - with WD40 might be the answer????

    It is now completely matt and mottled.
     
     

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    From that extract it says its anodized so i'm guessing its just aluminium? Must be just plain oxidation. I'd give it a polish with something like AG SRP or any polish you have to hand apart from T cut (because its shit, no other reason). And to prevent it oxidisation in the future use a wax on it like colli 476 or some sort of sealant with long durability.
     
     

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    bigmondy (07-08-2011)

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    If its really bad and a normal polish won't shift it, try a compound like g3 or f6 by hand and that'll give you a good result
     
     

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    bigmondy (07-08-2011)

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    Thanks sham sir.

    Will give that a try.

    I wonder if new BMW's are affected by this. When I order my new one (1 series vert - like yours ) in alpine white - I am tempted to spec the chrome option.
     
     

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