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Thread: What is the cause of this issue?

  1. #1
    Join Date
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    What is the cause of this issue?

    Purchased a E90 LCI M-Tech Front and Rear bumper from a company here. I will disclose that later but I am having a issue with it. I took both bumpers to my painter and he painted both of them A51 Montego Blue. He used the same process on the rear as he did on the front. The rear bumper is good to go, no peeling, nothing wrong with it at all. The front one has peeling.

    Here is a picture of the peeling that I first noticed..
    http://i.imgur.com/yBLioyW.jpg

    Here is a picture of what compressed air did to the paint..
    http://i.imgur.com/spuSMxl.jpg

    Looking at the image you can see that the paint is sticking to the primer which is grey. Then the primer is peeling off the bumper like it was done wrong and doesn't take much to make it come off.

    Now, the painter did both front and rear, but only the front is doing this. What do you think the issue is?

  2. #2
    Pelican Parts's Avatar
    Pelican Parts is offline Senior Member Supporting Vendor
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    The only thing I can think of is prep work before applying the primer.


    -Dmitry
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  3. #3
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    Thank you. I am still getting told my painter did bad prep work.

    Quote Originally Posted by Pelican Parts View Post
    The only thing I can think of is prep work before applying the primer.


    -Dmitry
    Thank you. I am still getting told my painter did bad prep work.

  4. #4
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    What strikes me is how smooth the underlying plastic is. I bet if you rub your fingers lightly over that plastic, it'd be as smooth as a baby's bottom. Such smoothness didn't let the primer have anything to 'grab onto' and you see the result - paint and primer separation.

    A possible remedy I'm thinking: rough up the surface a bit, microscopic sanding marks would give the primer something to stick to.

    I'll add a link at the bottom about painting plastic bumpers and you'll hear the people talk about two types of bumpers - those that come with primer already painted on and raw bumpers with no primer.

    So, maybe your front bumper was originally one of those raw ones.

    Link: https://www.youtube.com/watch?v=fFenJIC7ZnQ
    Last edited by JohnZ3MC; 04-07-2017 at 09:40 PM.

  5. #5
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    Quote Originally Posted by JohnZ3MC View Post
    What strikes me is how smooth the underlying plastic is. I bet if you rub your fingers lightly over that plastic, it'd be as smooth as a baby's bottom. Such smoothness didn't let the primer have anything to 'grab onto' and you see the result - paint and primer separation.

    A possible remedy I'm thinking: rough up the surface a bit, microscopic sanding marks would give the primer something to stick to.

    I'll add a link at the bottom about painting plastic bumpers and you'll hear the people talk about two types of bumpers - those that come with primer already painted on and raw bumpers with no primer.

    So, maybe your front bumper was originally one of those raw ones.

    Link: https://www.youtube.com/watch?v=fFenJIC7ZnQ

    It came primered. I was told it is primered from the factory. But yes the bumper under the primer is very smooth. No scratch marks on it.

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