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287 posts

Ultimate Geek

#224076 1-Nov-2017 13:46
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I've inherited a roof box, but the plastic around the hinges is broken. See image:


I've read a couple of posts that use some form of plastic repairs, but not sure what the best way to fix this is. Anyone who can help me please? 

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250 posts

Master Geek

  #1893643 1-Nov-2017 14:01
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I think the most reliable repair would be to cut a piece of metal that runs along into new plastic on both sides and screw/bolt into the broken piece and the sides.

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Ultimate Geek

  #1893657 1-Nov-2017 14:19
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Lastman: I think the most reliable repair would be to cut a piece of metal that runs along into new plastic on both sides and screw/bolt into the broken piece and the sides.


Thanks! Exactly what I thought as well at first, then I saw all the plastic repair things with moulding etc.


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Uber Geek

  #1893658 1-Nov-2017 14:25
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Although the question I would first ask is,


why has the plastic broken around the hinge ? - are things out of alignment? or do the hinges "over open"?,


Just repairing the plastic, might just simply open it up to breaking again,



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Uber Geek

  #1893666 1-Nov-2017 14:40
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Depends on how aesthetically pleasing you want the roof box to be after your repair.


If it was me, I would get a strip of metal and rivet it onto the plastic and hold it in place like that.  Provided the plastic is not brittle it should work a treat.


Or, another option which i did use to fix a spotlight mounting bracket on my Holden SS was to use a bit of plastic glue, and - wait for it - hot glue.  I let the hot glue gun get nice and hot and then layered the glue over the break about 3-4CM each side and then let it dry.  It held it together with little to no movement in the join, but it looked UGLY! thankfully the bracket is fully hidden by the front bumper, so saves that eyesore!

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Uber Geek

  #1893673 1-Nov-2017 15:00
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Some types of plastic can be welded, I would still be tempted to brace with pieces of metal as others have suggested.


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Uber Geek

  #1893776 1-Nov-2017 19:03
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Also - depending on the method of manufacture, you might be able to swap the hinges to the other side. You might also be able to move the hinge(s) along a bit.


You'll have to assess it - or post photos.

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Uber Geek

  #1893865 1-Nov-2017 21:04
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Some panel shops use to do plastic welding. Not sure if that’s still a thing, it worked well when I was repairing motorcycle fairing parts. I also would reinforce with a plate riveted to add strength.

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