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Repairs: Repairs

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#276565 - 28/02/2006 23:52 Plastic repair
wfaulk
carpal tunnel

Registered: 25/12/2000
Posts: 16706
Loc: Raleigh, NC US
A good while back I caught the air dam of my car on one of those standalone curbs that's supposed to tell you when you're all the way in a parking space. Anyway, when I backed out, it ripped the air dam slightly. But it's all one unit with the front bumper, which means that it's really expensive to replace.

So I'm looking to fix it myself. I was initially thinking that I could excise the piece of plastic at the nexus of the rip that keeps it the two pieces from lying in the same plane and then screw or bolt on a patch to hold it steady. But then I thought that it might make sense to ask here.

Any ideas?
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#276566 - 01/03/2006 05:24 Re: Plastic repair [Re: wfaulk]
gbeer
carpal tunnel

Registered: 17/12/2000
Posts: 2665
Loc: Manteca, California
If you are comfortable with the look of that repair, it should work fine.

Have you gone to a body shop for an estimate. Repairs without buying a new bumper cover are possible. Depends on the damage. You might find it affordable.

BTW: I had to replace a bumper cover recently. The cover part was about $700us.
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#276567 - 01/03/2006 13:32 Re: Plastic repair [Re: wfaulk]
larry818
old hand

Registered: 01/10/2002
Posts: 1033
Loc: Fullerton, Calif.
They do make repair kits for just this purpose. It comes with a kind of glue to put it back together and a flexible filler to make it smooth again.

These guys have it:

http://store.diyhut.com/carbure.html

I'm not sure I like the look of the kit.

Auto parts stores should have it.

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#276568 - 01/03/2006 13:48 Re: Plastic repair [Re: gbeer]
wfaulk
carpal tunnel

Registered: 25/12/2000
Posts: 16706
Loc: Raleigh, NC US
The fact of the matter is that all of the damage is "underneath". That is, on the part of the plastic that faces the road. I wouldn't really care so much about it now besides the fact that one side of it hangs down a little and scrapes on speedbumps, steep driveway entrances, etc. So a repair, regardless of the method, would look better than it does now, as you can see it hanging down a little. Maybe I should take a picture.
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#276569 - 01/03/2006 13:50 Re: Plastic repair [Re: larry818]
wfaulk
carpal tunnel

Registered: 25/12/2000
Posts: 16706
Loc: Raleigh, NC US
Somehoe I don't think that that stuff would hold a rip together.
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Bitt Faulk

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#276570 - 01/03/2006 15:23 Re: Plastic repair [Re: wfaulk]
schofiel
carpal tunnel

Registered: 25/06/1999
Posts: 2993
Loc: Wareham, Dorset, UK
It would help: I was going to suggest something you find over here (the Land of Lotus, ie. plastic, Cars). It's possible to use a plastic welder which gives good results on non-splintered plastic panels - even through paint. Your description here I am having trouble visualising.
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#276571 - 01/03/2006 18:15 Re: Plastic repair [Re: schofiel]
wfaulk
carpal tunnel

Registered: 25/12/2000
Posts: 16706
Loc: Raleigh, NC US
Sorry about the terrible image quality, but you should be able to get the idea of what I'm talking about.

Looking straight at the front of the car:


Looking from ground level up to the rip:
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Bitt Faulk

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#276572 - 01/03/2006 19:11 Re: Plastic repair [Re: wfaulk]
Robotic
pooh-bah

Registered: 06/04/2005
Posts: 2026
Loc: Seattle transplant
Plumber's tape and pop rivets?
No quick glue job will hold that.
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#276573 - 01/03/2006 19:18 Re: Plastic repair [Re: Robotic]
Neutrino
addict

Registered: 23/01/2002
Posts: 506
Loc: The Great Pacific NorthWest
Yep, I agree. You need to use some form of backing material and rivet it.
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#276574 - 01/03/2006 22:14 Re: Plastic repair [Re: Robotic]
mlord
carpal tunnel

Registered: 29/08/2000
Posts: 14477
Loc: Canada
Yup, my suggestion was going to be a small sheet of flat nylon/plastic (or stainless steel) on the backside, with four strategically placed pop rivets.

Cheers

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#276575 - 02/03/2006 03:04 Re: Plastic repair [Re: Neutrino]
gbeer
carpal tunnel

Registered: 17/12/2000
Posts: 2665
Loc: Manteca, California
Quote:
Yep, I agree. You need to use some form of backing material and rivet it.


Yep, my service manual has a big section of repairing collision damage. A rip like that can be repaired. The process is a lot like what is done for fiberglass repair. It just uses adhesives in place of resins. The particular adhesives depends on the specific plastic and may involve primers.
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Glenn

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#276576 - 02/03/2006 14:25 Re: Plastic repair [Re: wfaulk]
larry818
old hand

Registered: 01/10/2002
Posts: 1033
Loc: Fullerton, Calif.
Quote:
Somehoe I don't think that that stuff would hold a rip together.


If done properly with a proper kit, the repair is 100% as strong as the original. I've used it myself, many years ago.

Rob mentioned welding, but that only works on rigid plastic panels, which tend to be made of ABS. Your bumber is flexible polyurethane, which can't be welded.

The pop rivet method might not hold up long, as you're fixin' somethang flexible with somethang rigid. At speed, I'm sure there's motion in this area, which will work at the rivets.

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#276577 - 02/03/2006 20:12 Re: Plastic repair [Re: gbeer]
wfaulk
carpal tunnel

Registered: 25/12/2000
Posts: 16706
Loc: Raleigh, NC US
So I basically need to find a body shop that will attempt a repair instead of a replacement, then?
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Bitt Faulk

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#276578 - 02/03/2006 20:35 Re: Plastic repair [Re: wfaulk]
Robotic
pooh-bah

Registered: 06/04/2005
Posts: 2026
Loc: Seattle transplant
Repair shop?
That's a Sunday job- 20 minutes, tops.
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#276579 - 02/03/2006 21:10 Re: Plastic repair [Re: Robotic]
wfaulk
carpal tunnel

Registered: 25/12/2000
Posts: 16706
Loc: Raleigh, NC US
Give me quality instructions and I'd be happy to attempt it myself.
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#276580 - 03/03/2006 02:24 Re: Plastic repair [Re: wfaulk]
gbeer
carpal tunnel

Registered: 17/12/2000
Posts: 2665
Loc: Manteca, California
Download the attachment and unzip the web page. The links won't work but the directions are fine.


Attachments
277120-repair_files.zip (65 downloads)

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Glenn

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#276581 - 03/03/2006 16:49 Re: Plastic repair [Re: gbeer]
wfaulk
carpal tunnel

Registered: 25/12/2000
Posts: 16706
Loc: Raleigh, NC US
Cool. It sounds sorta like I'd be making fiberglass. Where do I get these repair materials?
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Bitt Faulk

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#276582 - 04/03/2006 23:45 Re: Plastic repair [Re: wfaulk]
gbeer
carpal tunnel

Registered: 17/12/2000
Posts: 2665
Loc: Manteca, California
Auto supply shop. Your nearest body shop should be able to tell you where they buy supplies.


Edited by gbeer (04/03/2006 23:45)

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