Used bumper repair

nmcgrawj

nmcgrawj

Club Member
i found a bumper for cheap that i think im gonna go pick up. The yard says its scratched and the clear coat is pealing.

What sanding methods should i use to even out and take down the clear coat to prep it for primer/paint? Is there an indicator of a scratch being "too deep" into the urethane that would make it not worth buying?

If it matters, its a front mustang cover.
 
nmcgrawj said:
i found a bumper for cheap that i think im gonna go pick up. The yard says its scratched and the clear coat is pealing.

What sanding methods should i use to even out and take down the clear coat to prep it for primer/paint? Is there an indicator of a scratch being "too deep" into the urethane that would make it not worth buying?

If it matters, its a front mustang cover.
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depends on how cheap... i have repaired covers that were torn in two before if i couldn't get a new one...
 
This is what Kevin/slideways told me. Sounds like a plan...


if the clear is peeling your going to want to make sure you sand it back untill you get to the areas where the clear is still well adheared (sp?) i would use 400-600 grit on a DA sander for this step. And assuming the scratches go into the plastic its nothing that a 2 part urethane bumper repair material couldnt fix rather easily.
 
320/400 would be fine...your gonna end up priming it anyway... sounds like your on the right road....
 
Nate if the clear is peeling start with 220, or 320 and go from there. I usually finish sand covers with 320 on a DA, then use Scotch Brite pad by hand.

If it's a total repaint and the paint is actually flaking and chipping....strip it with a DA using 80 grit. I've taken down covers to the urethane to refinish. This is my 96 Cobra cover. 8 years and 20,000 miles of summer only conditions and it still did this.

Before...
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Primer...Nason Urethane 2K
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After...Nason Ful-Thane Urethane paint (single stage) I highly recommend it. It's harder than bc/cc and resists future rock chips.
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SVT32VDOHC said:
Nate if the clear is peeling start with 220, or 320 and go from there. I usually finish sand covers with 320 on a DA, then use Scotch Brite pad by hand.

If it's a total repaint and the paint is actually flaking and chipping....strip it with a DA using 80 grit. I've taken down covers to the urethane to refinish. This is my 96 Cobra cover. 8 years and 20,000 miles of summer only conditions and it still did this.

Before...
Click to expand...


Sweet man, thanks for the tips!
 
Another for example...

Before, during, after. The white is not a primer, it's a 2K Urethane Sealer over the yellow Urethane 2K primer. I loved using the sealer.

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Why do you use the white sealer? Color change applications?

Did you put on the primer, sealer, then topcoat?
 
nmcgrawj said:
Why do you use the white sealer? Color change applications?

Did you put on the primer, sealer, then topcoat?
Click to expand...

Primer, sealer, paint.

The sealer is used so you get a nice level paint job. It is as hard as a rock and it keeps any old paint from "popping" under your new paint job. It is also good for when you have original paint here and there and primer here and there from body work. If you are doing a complete job it's nice to coat the entire car in a sealer then paint it.

I used the white sealer on this yellow cover because the lighter the paint, the lighter the sealer you need. It really makes the yellow paint bright. Say I painted a used black cover yellow. It would not be as bright, nor would it match the rest of the car that I used the white sealer on either.

I highly recommend this for bumper covers and complete paint jobs. For black jobs, you can use grey sealer. Nason makes most colors, but they didn't make white. Dupont was the only brand that made white. It was a little bit more money since it's Dupont, but if you are spraying black just go with grey.
 
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SVT32VDOHC said:
Primer, sealer, paint.

The sealer is used so you get a nice level paint job. It is as hard as a rock and it keeps any old paint from "popping" under your new paint job. It is also good for when you have original paint here and there and primer here and there from body work. If you are doing a complete job it's nice to coat the entire car in a sealer then paint it.

I used the white sealer on this yellow cover because the lighter the paint, the lighter the sealer you need. It really makes the yellow paint bright. Say I painted a used black cover yellow. It would not be as bright, nor would it match the rest of the car that I used the white sealer on either.

I highly recommend this for bumper covers and complete paint jobs. For black jobs, you can use grey sealer. Nason makes most colors, but they didn't make white. Dupont was the only brand that made white. It was a little bit more money since it's Dupont, but if you are spraying black just go with grey.
Click to expand...

Makes sense. You did not use a sealer on that black cobra bumper though right?

Did you have to add anything to the Nason Ful-thane primer/black paint you used to make it more flexible since its on a urethene bumper? Or is that built into that kind of paint?
 
nmcgrawj said:
Makes sense. You did not use a sealer on that black cobra bumper though right?

Did you have to add anything to the Nason Ful-thane primer/black paint you used to make it more flexible since its on a urethene bumper? Or is that built into that kind of paint?
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I know we covered more info through PM's, but...No, I did not use a sealer on the Cobra cover. I stripped the entire thing down to the bumper material, two coats of 2K primer and painted it. I think I was out of sealer at the time and I was selling that car to a friend anyways.
 
SVT32VDOHC said:
I know we covered more info through PM's, but...No, I did not use a sealer on the Cobra cover. I stripped the entire thing down to the bumper material, two coats of 2K primer and painted it. I think I was out of sealer at the time and I was selling that car to a friend anyways.
Click to expand...


:thumbsup:
 
SVT32VDOHC said:
Primer, sealer, paint.

The sealer is used so you get a nice level paint job. It is as hard as a rock and it keeps any old paint from "popping" under your new paint job. It is also good for when you have original paint here and there and primer here and there from body work. If you are doing a complete job it's nice to coat the entire car in a sealer then paint it.

I used the white sealer on this yellow cover because the lighter the paint, the lighter the sealer you need. It really makes the yellow paint bright. Say I painted a used black cover yellow. It would not be as bright, nor would it match the rest of the car that I used the white sealer on either.

I highly recommend this for bumper covers and complete paint jobs. For black jobs, you can use grey sealer. Nason makes most colors, but they didn't make white. Dupont was the only brand that made white. It was a little bit more money since it's Dupont, but if you are spraying black just go with grey.
Click to expand...



You would be suprised however, Sometimes when your painting white, it pops the most with black underneath it. Obviously harder to get coverage however.
 
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