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Bumper repair #1662988
15/01/2023 22:10
15/01/2023 22:10
Joined: Dec 2005
Posts: 8,080
Lightwater, Surrey UK
DaveG Offline OP
Club Treasurer Member 311
DaveG  Offline OP
Club Treasurer Member 311
Je suis un Coupé

Joined: Dec 2005
Posts: 8,080
Lightwater, Surrey UK
Not for a Coupe, but for my youngest son's Hyundai i10, where the rear bumper has become separated from the rear wing by virtue of the "joining strips" breaking away from the edge of the bumper after a small accident, see first pic below. There is other damage towards the bottom of the bumper also (a "tear" in a flat section).

The pic is from an eBay seller of a bumper I was thinking of buying, but has the same damage. The seller suggested that a "plastic weld" might work, but I'm not sure if that meant some form of glue, like JB weld, or those little metal "staples" that you heat up and melt into the plastic and the cut off the "stalks" (see second pic).

I've seen some neat repairs made usings these staples, and perhaps the "right angle" ones would work to reattach the "joining" strips, but on the other hand the staples might melt all the way through or just not melt into enoigh plastic for a proper join. The other damage to the flat section looks easy enough to do from the rear using the regular "curly" staples.

Does anyone have any experience of either JB weld (or similar) or "hot staples" for bumper repairs? The Hyundai bumper seems a liitle thinner than a Coupe bumper, which might make a difference...

Attached Files

1996 Portofino 20vt & 2000 Pearl White Plus
1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
Re: Bumper repair [Re: DaveG] #1662989
15/01/2023 22:35
15/01/2023 22:35
Joined: Dec 2005
Posts: 606
Drakelow
Jamiepm Offline
Club member 1989
Jamiepm  Offline
Club member 1989
Enjoying the ride

Joined: Dec 2005
Posts: 606
Drakelow
Not an answer on the staple weld thingy, but…..

There are quite a few mastics that are used in the building trade that would definitely stick those bits of plastic together

I’ve used this on loads of things where I couldn’t get a mechanical fixing and it’s never failed, the name is quite apt

https://trade.evo-stik.co.uk/sites/...t/TDS00269-sticks-like-shit-adhesive.pdf

Cheers Jamie


Enjoying Coupe life
Re: Bumper repair [Re: DaveG] #1663003
16/01/2023 15:08
16/01/2023 15:08
Joined: Dec 2005
Posts: 530
Guildford
wink Offline
Club member 1453
wink  Offline
Club member 1453
Enjoying the ride

Joined: Dec 2005
Posts: 530
Guildford
I would give JB Weld a try. Not sure about the 'Sticks like ...' - I've used it for bonding flat surfaces, also CT-1 is similar and IMO better stuff. But they both stay flexible & if the bond is under tension I think it would fail over time.

Re: Bumper repair [Re: DaveG] #1663010
16/01/2023 20:53
16/01/2023 20:53
Joined: Dec 2005
Posts: 8,080
Lightwater, Surrey UK
DaveG Offline OP
Club Treasurer Member 311
DaveG  Offline OP
Club Treasurer Member 311
Je suis un Coupé

Joined: Dec 2005
Posts: 8,080
Lightwater, Surrey UK
Yeah, "Sticks like..." mentions most things but not plastic. Seems like an epoxy resion is needed. There are a few options all with similar reviews (mostly good, but still several that say no good) and I was leaning towards JB Weld.


1996 Portofino 20vt & 2000 Pearl White Plus
1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
Re: Bumper repair [Re: DaveG] #1663014
16/01/2023 21:55
16/01/2023 21:55
Joined: Jun 2006
Posts: 23,238
North Wales
Theresa Offline
Former Presidentessa
Theresa  Offline
Former Presidentessa
Forum Fossil

Joined: Jun 2006
Posts: 23,238
North Wales
Plastic weld is heating up and partly melting the two surfaces with something like a soldering iron and using something like a cable tie for the extra plastic to melt onto and weld the two things together.
If you have a soldering iron, have a practise with melting a couple of plastic surfaces and then using a melting cable tie to weld and join those surfaces.
Once soft, the plastic can be moved/pushed/manipulated across the crack to make the 'weld.

I'm not very technical, so that's the best I can explain it, sorry.

Re: Bumper repair [Re: DaveG] #1663026
17/01/2023 16:41
17/01/2023 16:41
Joined: Dec 2005
Posts: 8,080
Lightwater, Surrey UK
DaveG Offline OP
Club Treasurer Member 311
DaveG  Offline OP
Club Treasurer Member 311
Je suis un Coupé

Joined: Dec 2005
Posts: 8,080
Lightwater, Surrey UK
I understand. I've seen the results, can be invisible after subsequent prep and painting...


1996 Portofino 20vt & 2000 Pearl White Plus
1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
Re: Bumper repair [Re: DaveG] #1663030
18/01/2023 06:39
18/01/2023 06:39
Joined: Sep 2009
Posts: 4,842
ation
szkom Offline
Club member 2000
szkom  Offline
Club member 2000
Forum is my job

Joined: Sep 2009
Posts: 4,842
ation
I'm not sure how well an araldite type adhesive would hold up. It possibly could be too brittle, but equally one of the mastic type glues might not grip well enough if the plastic is a greasy type.

One adhesive I do think would hold is Plexus. It's been a fair while since I used it so can't remember the product code, but hopefully there aren't too many choices.

However one thing that stands out for me is the complexity of the moulding around the bumper mounting tabs - could the shaping be deliberate to allow the bumper cover to unzip in a crash; pedestrian protection?

Re: Bumper repair [Re: DaveG] #1663054
18/01/2023 22:49
18/01/2023 22:49
Joined: Dec 2005
Posts: 8,080
Lightwater, Surrey UK
DaveG Offline OP
Club Treasurer Member 311
DaveG  Offline OP
Club Treasurer Member 311
Je suis un Coupé

Joined: Dec 2005
Posts: 8,080
Lightwater, Surrey UK
I will look into Plexus, thanks. You could be right about the "unzip" feature. Chances are that in an accident any glued (adhesive) joint would just come apart again anyway, which is fine. I just want a repair that will hold up to everyday drivng including motorways without having the side of the bumper flapping about in the wind, and without regularly remaking a join with clear tape on the outside (I think it's designed for clear plastic greenhouse roof panels or similar?)


1996 Portofino 20vt & 2000 Pearl White Plus
1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
Re: Bumper repair [Re: DaveG] #1663057
19/01/2023 08:37
19/01/2023 08:37
Joined: Sep 2009
Posts: 4,842
ation
szkom Offline
Club member 2000
szkom  Offline
Club member 2000
Forum is my job

Joined: Sep 2009
Posts: 4,842
ation
Helicopter tape perhaps?

I'm reasonably sure the Plexus will do the job and probably survive the car . Bits I do remember from using it is that it shrinks slightly when it cures and i seem to recall a bit of heat while it goes off. Try not to use clamps too aggressively to get the shape and position correct, only to help locate the tabs if that makes sense?

Re: Bumper repair [Re: szkom] #1663170
24/01/2023 20:16
24/01/2023 20:16
Joined: Dec 2005
Posts: 8,025
South Cambs
B
Barmybob Offline
Hon Club Member: 003
Barmybob  Offline
Hon Club Member: 003
Je suis un Coupé
B

Joined: Dec 2005
Posts: 8,025
South Cambs
The body shop that repaired a bumper for me, used a plastic welding method. From what they explained it must have been something like this with plastic welding rods & special filler.

https://www.polyvance.com/video/nitrogen-hot-air-welding/bumper-repair-with-hot-air-plastic-welder

This was impressive but the most impressive thing they did was paint a flexible rubber boot spoiler.
Still struggle to believe how that worked, flexible spoiler but the paint never cracked or splintered.


Gone Audi mad!

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