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will these scratches buff out?

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Old 11-07-2014, 11:14 AM   #1
RenGen
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Default will these scratches buff out?

installed my new tail lights - however i ended up scratching the bumper a bit in the process.

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Old 11-07-2014, 11:15 AM   #2
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video is set to private but rule of thumb with scratches are if you can feel the scratch with your hand you cant buff it out.
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Old 11-07-2014, 11:18 AM   #3
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video is set to private but rule of thumb with scratches are if you can feel the scratch with your hand you cant buff it out.
oops! Ok its visible now. hoping it will be ok in spring when i get another detail where they wash wax buff, etc.

also i gotta fix some hail dents but i dont have money :'(
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Old 11-07-2014, 05:05 PM   #4
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The first set of scratches I see in the video look like they might be...but the other (2) look like stress cracks in the paint??

If they're not stress cracks, then what wardNM05 said above is correct....if you can feel them ("carefully" run your fingernail across them)...you won't be able to buff them out.
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Old 11-07-2014, 05:12 PM   #5
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Won't buff out...
Even if it did, due to heavy wet sanding, you wouldn't have enough clear left to withstand the element.

The rule is: if you can feel the scratch, it's a repaint.
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Old 11-08-2014, 07:17 AM   #6
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Originally Posted by 05 Mustang View Post
The first set of scratches I see in the video look like they might be...but the other (2) look like stress cracks in the paint??

If they're not stress cracks, then what wardNM05 said above is correct....if you can feel them ("carefully" run your fingernail across them)...you won't be able to buff them out.
stress crack? so do you think they were there before or did it happen from tail light scraping?

and btw when i run my finger nail over i can't feel them...surface feels smooth so hoping it will be ok. I buffed my car earlier spring 2014 so I will wait til spring 2015 to buff again because I hear too much buffing can be bad as well.

Last edited by RenGen; 11-08-2014 at 07:20 AM.
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Old 11-10-2014, 10:41 AM   #7
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Interesting......that too much buffing can be bad as well. I guess you can buff the clear coat right off if you use too much pressure, wrong pad and too many times a year.

Pascal what do you say about this?
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Old 11-10-2014, 01:04 PM   #8
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The curved or rounded "scratches" are actually stress cracks. It means something or someone leaned up against the bumper hard enough to deform the plastic bumper cover and cracked the paint when the bumper deformed. Those you cannot buff out.

The first scratch in the video looks like it's down to the base coat (no clearcoat left to buff). So IMO, all the damage would need a repaint to repair it.
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Old 11-10-2014, 06:43 PM   #9
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Originally Posted by 07 Stang View Post
Interesting......that too much buffing can be bad as well. I guess you can buff the clear coat right off if you use too much pressure, wrong pad and too many times a year.

Pascal what do you say about this?
Buffing is abrasive at a micro level so sure, you can wear out the clear if you were to keep it up for hours but you'll burn the clear way before that. The heat will be too much.
What kills a paint job is too much wet sanding due to deep scratches.

Typically, the factory uses 2 medium coats of clear on our cars and wet sanding with paper coarser than 1200 grit will take off one coat of clear at least. Bad news.
Here in FL, you paint job won't last past two summers in such a case, unless your car never sees the sun but it's unlikely...
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Old 11-11-2014, 06:29 AM   #10
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Buffing is abrasive at a micro level so sure, you can wear out the clear if you were to keep it up for hours but you'll burn the clear way before that. The heat will be too much.
What kills a paint job is too much wet sanding due to deep scratches.

Typically, the factory uses 2 medium coats of clear on our cars and wet sanding with paper coarser than 1200 grit will take off one coat of clear at least. Bad news.
Here in FL, you paint job won't last past two summers in such a case, unless your car never sees the sun but it's unlikely...
I've only had my car buffed once in its life and I went to a very reputable detail shop that knows mustangs and they always buff real lightly. I went by them yesterday and they said it should buff out, but I'm gonna wait til spring to get it done.

what is a stress crack exactly? did I get the stress crack from laying the tail light on the bumper and the weight of the tail light made it crack? Or did i have that crack before?

but yes, the scratches do not catch my nail at all and with my finger they feel as smooth as rest of the car.
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Old 11-11-2014, 06:52 AM   #11
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Quote:
Originally Posted by RenGen View Post
stress crack? so do you think they were there before or did it happen from tail light scraping?

and btw when i run my finger nail over i can't feel them...surface feels smooth so hoping it will be ok. I buffed my car earlier spring 2014 so I will wait til spring 2015 to buff again because I hear too much buffing can be bad as well.
Quote:
Originally Posted by RenGen View Post
I've only had my car buffed once in its life and I went to a very reputable detail shop that knows mustangs and they always buff real lightly. I went by them yesterday and they said it should buff out, but I'm gonna wait til spring to get it done.

what is a stress crack exactly? did I get the stress crack from laying the tail light on the bumper and the weight of the tail light made it crack? Or did i have that crack before?

but yes, the scratches do not catch my nail at all and with my finger they feel as smooth as rest of the car.
I wasn't trying to worry you when I mentioned that the stress crack....but the shapes of those last (2) areas you showed in your vidoe sure looked like it.

A paint stress crack in a bumper is typically caused by some sort of impact.
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Old 11-11-2014, 07:30 AM   #12
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Quote:
Originally Posted by 05 Mustang View Post
I wasn't trying to worry you when I mentioned that the stress crack....but the shapes of those last (2) areas you showed in your vidoe sure looked like it.

A paint stress crack in a bumper is typically caused by some sort of impact.
damn i mean i had a bit of trouble installing the tail light but do u really think i got those stress cracks from the weight of the tail light? or maybe from something else?

so whats the fix for stress crack? gotta sand away all the paint and repaint bumper? **** it i guess its here to stay then whatever doesnt buff out. not surprised god loves ****ing my life as much as he can.
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Old 11-12-2014, 09:36 AM   #13
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Quote:
Originally Posted by RenGen View Post
damn i mean i had a bit of trouble installing the tail light but do u really think i got those stress cracks from the weight of the tail light? or maybe from something else?

so whats the fix for stress crack? gotta sand away all the paint and repaint bumper? **** it i guess its here to stay then whatever doesnt buff out. not surprised god loves ****ing my life as much as he can.
You definitely didn't get stress cracks from tailights. Watch your video again, and really look at the difference between the first set of marks and the second/third. The first set looks like the bottom of the taillight rubbed up against the clear and cause them....there's no pattern. Now look at the second and third....there appears to be a similar pattern with both of them.

The first set, as long as they aren't deep, should buff out. Stress cracks do not buff out...or wet sand out. Stress cracks are damaged areas that would require repainting.

...again, I'm only mentioning what I "assume" to see in the video. If you want reassurance, take it to a body shop and get their opinion. I hope I'm wrong!
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Old 11-12-2014, 12:59 PM   #14
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If you can't feel the stress cracks under your nail that means the base and/or color coat is what is damaged. No amount of sanding or buffing will get them out as they are UNDER the clear coat. The only way to get under the clear coat is to remove it. You do that, you ruin the paint on the bumper.

If the cracks are that bothersome, get the bumper repainted.
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Old 11-12-2014, 06:31 PM   #15
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Quote:
Originally Posted by RenGen View Post

what is a stress crack exactly? did I get the stress crack from laying the tail light on the bumper and the weight of the tail light made it crack? Or did i have that crack before?

but yes, the scratches do not catch my nail at all and with my finger they feel as smooth as rest of the car.
Stress cracks are typically on the body panel itself so in your case, the bumper.
With urethane bumper you'll get a stress crack upon light impact or too much weight pressure on a small area.
So when the bumper cracks, the paint does as well.
You didn't get a crack from laying your tail light on it, that crack was there before...

As far as not feeling the ridges of the scratches with your nails, it's fine but do not get those guys to wet sand coarser than 2000 grit before buffing because too much clear will come off and your finish will dull shortly.
If after that you still can see them, then you'll have to re-spray if you can't live with the results.
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Old 11-12-2014, 06:31 PM
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