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Old 06-16-2008, 05:18 PM
cruisingdog cruisingdog is offline
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Location: SF Bay Area, Califunky
 
Join Date: May 2008
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Mein Auto: z4 2.5i roadster
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Quote:
Originally Posted by Guest84 View Post
This is what the surface looked like after sanding(Pic below). You may panic somewhat your first time doing this, but rest assured, high blood pressure after scratching up your clear coat is normal. We'll work this out with Machine Polish.


Beginning with Machine Polish #1, use the random orbit polisher up and down, left and right over the area. Finish up with Machine Polish #3, using a separate pad for each. Your finish will be as good as new, with a slight hairline "fracture" where you did the touch up.


I do not use the clear coat that comes with the BMW paint kit nor the application brush. 3 or 4 coats of paint is plenty, and the clear coat topping seems like a waste since you end up sanding off the high spots anyway.

Don't be afraid to try it if you have the proper tools!

And if your friends come over, don't give them fish, teach them to fish! I put Mark to work (mv945) with the PC and machine polishes on his Jet Black M3 after he had an encounters with wood on the roadway, kicked up along the side of his finish. The Machine polishes and the PC took just about all evidence of any scratches (since these scratches did not penetrate to the primer)

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I have a question about this technique. I'm not sure if the OP is still on this site but I would appreciate a response from anyone in the know.

There was mention of not using clear coat. I assume that the scratch was filled in with paint up to the level of the clear coat and then polished. If so, isn't that why the 'micro hairline fracture' is visible. You basically have a clear lacquer touching a paint and hence a line will be visible ?

If I were to use clear coat after filling in the paint, how should I do this correctly ? Would I first have to 'etch' some of the over filled paint out and then put the clear coat on ?

Thanks for such a good description of this process. Very informative.
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2005 Z4 2.5i
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