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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wash, Wax, Detailing and Cosmetic protection/repairs > Paint chips on bumper



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      02-07-2007, 03:38 PM   #1
heath
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Paint chips on bumper

I have a few paint chips on my front bumper and a bit larger chip on the rear bumper. I've read a few threads on cleaning with alcohol, using a toothpick with the dealer paint to fill in the chips, sanding down with 1500/2000 grit paper and then polishing over.

Can this be done on the plastic used on the bumpers? The chips went all the way to the plastic.
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      02-07-2007, 04:40 PM   #2
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sanding the bumper might not work so well. You might just cover with touch-up paint. rock chips on the bumper are a factof life, unfortunately. If they really bother you, consider something like clear-bra.
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      02-07-2007, 05:00 PM   #3
heath
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Yeah I think I can live with the small chips on the front bumper, but the rear I need to work on. Anyone tried using a bit of wet sanding on the rear bumper?
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      02-07-2007, 05:04 PM   #4
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You can do the clean/fill/sand/polish method on a bumper; just remember that plastic heats up much more quickly than metal so when you polish (if using a rotary), keep it moving quickly. I always recommend higher grits (2000/3000), but if you are confident taking out 1500/2000 grit marks go for it.

How large is the rear bumper chip? If it's larger than a quarter you're into the realm of needing actual bumper paint (with flex agents).
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      02-07-2007, 05:15 PM   #5
heath
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It's much smaller than a quarter, there are two indivual nicks but each are much much smaller than a quarter.

Here is the plan:

1) Possibly sand the edges of the nicks a bit as they stick out using 2000 grit
2) Fill nicks using a toothpick and retail paint, let dry
3) Sand to smooth
4) Polish (would ScratchX work), and should I do it by hand because of the heat or use a PC?

Also, I've seen something at PepBoys called a WAXXpro random orbital that is only about 30$... would it be a bad dea to go with this over the porter cable (which is much more expensive)?

Last edited by heath; 02-07-2007 at 05:33 PM..
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      02-15-2007, 01:00 PM   #6
montreal_bimmer
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drive slower.....

as far as repair, i used to use a permanent black paint marker and fill them up. didnt get rid of them, but you hardly noticed them
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      02-15-2007, 03:34 PM   #7
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Quote:
Originally Posted by heath View Post
It's much smaller than a quarter, there are two indivual nicks but each are much much smaller than a quarter.

Here is the plan:

1) Possibly sand the edges of the nicks a bit as they stick out using 2000 grit
2) Fill nicks using a toothpick and retail paint, let dry
3) Sand to smooth
4) Polish (would ScratchX work), and should I do it by hand because of the heat or use a PC?

Also, I've seen something at PepBoys called a WAXXpro random orbital that is only about 30$... would it be a bad dea to go with this over the porter cable (which is much more expensive)?
You're going to have a heck of a time removing 2000 grit marks with ScratchX. A PC is fine on the bumper, just remember to let the touchup dry for at least 48 hours before polishing, or it'll pop right out.
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