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Go Back   Madabout Kitcars Forum > Mad Build Area > Tribute Automotive Builds

Tribute Automotive Builds Discuss your Tribute kit build

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  #1  
Old 3rd November 2018, 09:30
WorldClassAccident WorldClassAccident is online now
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Default Anyone tried plastic welding to fix a modern bumper?

Not related to Tribute's fine offerings but I have twatted the bumper on the Mighty Merc driving slowly into an unseen raised kerb. I don't really want to replace the whole thing because of one small crack but it won't glue shut.

I have seen some videos of guys using soldering irons and similar to 'weld' broken bumpers together.

Anyone tried this?
Hints and tips if you have please.

Photos to follow of my attempts, possibly followed by buying a new bumper
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  #2  
Old 3rd November 2018, 10:00
wozzy wozzy is offline
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I did some repairs to cracked motorbike fairings using a soldering iron and some cable ties as the solder haha
if you do it from the back you can use the cable tie to bond everything together, have a practice on some scrap plastic to get a feel of the depth you will need to melt to get the bonding secure
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Old 3rd November 2018, 13:14
Nostromo Nostromo is offline
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Could you not add fiberglass on the inside of the crack or is the point to have a go at plastic welding?
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  #4  
Old 3rd November 2018, 15:55
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Jaguartvr Jaguartvr is offline
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You'll need to key up the bumper to give the fibreglass something to stick to. It's one of the few things it won't stick to, unlike skin and hair!
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  #5  
Old 3rd November 2018, 16:14
WorldClassAccident WorldClassAccident is online now
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Apparently the stuff they make bumpers of is really difficult to get stuff to stick to it. Superglue and epoxy don't do a thing apparently.

I am hoping that the melt weld with additional ABS filament from my 3D printer will work. I then need some plastic filler and paint the area.

Worse case is I replace the bumper which is where I am now.
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Old 3rd November 2018, 18:06
Mitchelkitman Mitchelkitman is offline
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Quote:
Originally Posted by WorldClassAccident View Post
Apparently the stuff they make bumpers of is really difficult to get stuff to stick to it. Superglue and epoxy don't do a thing apparently.

I am hoping that the melt weld with additional ABS filament from my 3D printer will work. I then need some plastic filler and paint the area.

Worse case is I replace the bumper which is where I am now.
Will plastic filler have the same not-stick properties of GRP resin? If it's only a small crack, is it maybe worth (at least) getting a quote from a pro repair place?
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Old 3rd November 2018, 20:56
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IanA IanA is offline
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With the same proviso- test on something else or an unseen area first- OSMA waste pipes are sometimes glued with a solvent based liquid. Too much and you'll have a sticky mess on the drive and a fully frontal nude Merc...

Google: SAFETY DATA SHEET OSMA SOLVENT CEMENT NO.2

Last edited by IanA; 3rd November 2018 at 20:58..
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  #8  
Old 3rd November 2018, 21:29
landmannnn landmannnn is offline
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You will need one of those soldering irons designed for plastic welding.
The hardest thing is finding the right plastic welding sticks, you will need to buy a range, then it is trial and error.
The end result will not be as strong and will look a bit of a mess from the inside, but will retain flexibility.
If you are going to do it, practice on some scrap first, it isn't easy.
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Old 4th November 2018, 12:24
WorldClassAccident WorldClassAccident is online now
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Might get it done properly then
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  #10  
Old 5th November 2018, 12:33
kon kon is offline
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Have you considered a kit like this one?
https://motornuts.co.uk/pbf-kit
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Old 5th November 2018, 16:09
WorldClassAccident WorldClassAccident is online now
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That is like what I was going to use after fixing the cracks. Still need to weld the cracks shut first though.
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Old 5th November 2018, 19:01
landmannnn landmannnn is offline
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Quote:
Originally Posted by WorldClassAccident View Post
Might get it done properly then

A local body shop won't charge a lot of you take along a bumper and get them to weld it, especially on a Saturday morning with cash.
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