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Re-Furbed Alloy Wheel Paint Issues

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All, I had my E46 BMW wheels re-furbed in late 2017. They looked great, and I've had no problems until this year when Inoticed what looked like severe blistering. On closer inspection, the surface isn't really blistered, rather discoloured and micro-cracked under, or within the clearcoat. It looks to me like theres something under the paint surface pushing up through it and cracking the paint/clearcoat:

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I phoned up the place that did them (they specialise in wheel re-furbs) and from my description they said its common with old alloys (these are 2002) - something to do with once they're blasted, there's a corrosion or some other kind of process that causes accelerated corrosion. The only thing they told me when I collected them was not to use alloy wheel cleaner - which I haven't. I sent the pictures and they've asked me to take the car in to have a look.

Has anyone else had this kind of issue, and is the explanation a load of guff?

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Never seen it before but looks like a reaction between the primer and paint. Don't think it's the alloy corroding underneath.

Sounds like a load of pish tbh. They should've cleaned the surface fully and if done properly it should've sealed the metal inside the primer/paint so it shouldn't corrode like that again.

Saying that, most agree powdercoat is best for longevity

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14 hours ago, momo said:

Never seen it before but looks like a reaction between the primer and paint. Don't think it's the alloy corroding underneath.

Sounds like a load of pish tbh. They should've cleaned the surface fully and if done properly it should've sealed the metal inside the primer/paint so it shouldn't corrode like that again.

Saying that, most agree powdercoat is best for longevity

Im taking it back this afternoon, so I'll see what they make of it. Thanks.

 

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So they had a look, said they'd never seen anything like it, and that they'd re-do them for £50 a wheel (there is a bit of kerbing / wear and tear to be fair, which obviously isn't their fault). Apparently they've changed their clear coat now. BTW, they were powdercoated.

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So they were powdercoated then clear coated? That's how it should be done for a good finish.

Might be alright if they do it now.

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12 hours ago, momo said:

So they were powdercoated then clear coated? That's how it should be done for a good finish.

Might be alright if they do it now.

Previously, they were powder coated and clearcoated.

They have now changed their clearcoat type.

They are baked several times during the process to get rid of moisture, and blasted to get rid of corrosion, so I don't see how the process should promote corrosion any more than when they were originally made, and lasted 15 years or so.

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Yep, might just have been a bad job at the time! Hopefully should last longer this time around

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