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Machine Polishing Need help with Machine polishing

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Old 21-06-2017, 07:40 PM   #1
laurieballard
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Struggling with HexLogic Orange and Megs 105?

Hi

My other half has a black metallic BMW Z4 which has a fair amount of scratches, mainly from brushing bushes up country lanes.

The scratches don't look deep so was expecting them to come out fairly easily with the Orange HexLogic and Megs 105 but it seems not....

This is my first attempt with a DA, I watched Junkmans videos several times and have only done one small section so far.

Really happy that I got rid of the swirls but after 4 passes, the scratches are still there.

Could it be the hardness of the BMW paint?
Would I benefit from using a Microfibre cutting pad with the 105?

Ta
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Old 21-06-2017, 08:17 PM   #2
Forsh
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Can you feel the scratches at all with your finger nail? even slightly?

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Old 21-06-2017, 11:08 PM   #3
Kickasskev
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BMW paint is usually pretty tough, may need to have a machine polish or wet sand if you want everything totally removing.

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Old 22-06-2017, 02:32 AM   #4
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IMO megs 105 doesn't have a very long work time, it gets dry and breaks down quicker than say something like Menzerna FG400. Or even 3M FCP (which afaik is only really suitable for rotary polishers)

I have owned BMW's Audi's and Volvo's all of which Ive had to use an agressive compound and pad for correction on a rotary buffer. below are the results on my Volvo XC70 with a ceramic clear coat after wet sanding, FYI wet sanding was the only way to restore a close to acceptable finish on this car.

But unless the BMW has a ceramic clear coat (I believe some mercs do) then correction maybe achievable with just polishing, although it can be actually more sympathetic to the paint to wet sand.

BEFORE:



After wet sanding and compounding:



After refining:



Looks like two RIDS under the light source but its the light frame reflecting.
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Old 22-06-2017, 07:36 AM   #5
laurieballard
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Quote:
Originally Posted by Forsh View Post
Can you feel the scratches at all with your finger nail? even slightly?

I tried but if you can feel them with your fingernail, its not noticeable easily.

I am going to try again on another panel this weekend to see what I can get.

Perhaps I was expecting too much, the Megs 205 and White pad I used initially seemed to do naff all so I went with 105 and Orange.

Ta
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Old 22-06-2017, 07:51 AM   #6
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You are going about it the right way least aggressive first.

You have removed the swirls so you can see some correction and that is probably 1 or 2 microns of clear coat you have removed. If the scratches are 5 microns deep then that's 5x more polishing you need to do to remove them.

This is why a paint thickness gauge is a good idea when you're removing more than just swirls and marring

Following up with something like SRP, BH Cleanser Polish or AF Triple will fill and disguise the remaining imperfections meaning you can leave more clear coat - unless it's a show car chasing every last mark is a difficult road to go down

I've used Megs Ultimate compound on my wifes car that has been painted and the swirls and light scratches came out fairly easily. Same combo on my BMW 320d and it took a lot more work for the same result

Stick at it

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Old 31-07-2017, 03:37 PM   #7
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Quote:
Originally Posted by ctownshend View Post
it can be actually more sympathetic to the paint to wet sand.
Out of interest - how could it be more sympathetic to wet sand than machine polish? (Genuine question.)

As I understand it, you're just levelling the paint to the same depth as the scratch, so any method used to get it to that level is equally sympathetic, unless you blow past the depth of the scratch and remove too much clear coat - however surely you're most likely to do that with a more aggressive product like sandpaper than you are with compound?

My main concern with using sandpaper is that I'll remove any orange peel from the panel, leaving me with one overly smooth panel in comparison to the rest of the car which has orange peel, requiring sanding of the whole car to match it all back up.
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