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  1. #1

    Default Leaking windscreens on 450's - cause Discovered?

    Discovered something veerrryyyy interesting. Cleaned the car today. Washed and leathered the outside. Did the inside. Went back outside and nicer a load of water on the scuttle under the screen. But where it it come from?



    Then the penny dropped.



    Opened the door and closed it while watching the screen, and sure enough some water spurted out. arefully pried out the external weatherstrip and discovered a length about 8 inches long where the screen wasn't sealing. Dried it out, pumped the gap full of PU adhesive, parked it up to dry in the garage being careful to close the door with the window open. Don't use silicone for this - as it cures it excretes water and acetic acid, which are hugely destructive to the steel. Use a PU adhesive such as Sikaflex or Tiger Seal.



    So I may have discovered the mechanism which causes 450 screens to leak with age - constant pulses of air pressure flexing the screen against it's adhesive over years and years. I may try and sort a cabin vent of some kind to help equalise pressure when closing the doors.
    Last edited by Chopper; 15th September 2018 at 13:56.
    2004 Smart Fortwo Passion Cabro, low miles, commuting scoot.
    2016 Kia Sportage 1.7 diseasel, family wagon.
    1991 Yamaha FZR600 3HE7 Kocinski edition, owned since new.
    8 x bicycles. What can I say, I like bikes!

  2. #2
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    Default Re: Leaking windscreens on 450's - cause Discovered?

    I prefer Puraflex 40 from Soupstation. Used it to seal windshield, quarter lights and rear Cabrio window on Smart cars. Also used it to seal holes and cracks in drive shaft boots & steering gaiters, repair vibration dampers and to resole my Crocks. Good stuff still less than 5 per cartridge and available in both black and white. Not only a sealant but glue as well.


  3. #3
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    Default Re: Leaking windscreens on 450's - cause Discovered?

    Got enough sole material to last me out:


    A roll of rubber 70 cm wide by 5 metres long.

  4. #4

    Default Re: Leaking windscreens on 450's - cause Discovered?

    I've a good selection of Sikaflex on hand, had a tube of 255FC in the box, so In it went. I'm not especially brand loyal, but happened to have several varieties of Sika including the correct glass one.
    2004 Smart Fortwo Passion Cabro, low miles, commuting scoot.
    2016 Kia Sportage 1.7 diseasel, family wagon.
    1991 Yamaha FZR600 3HE7 Kocinski edition, owned since new.
    8 x bicycles. What can I say, I like bikes!

  5. #5
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    Default Re: Leaking windscreens on 450's - cause Discovered?

    Puraflex 40 is made by Sika but almost half price.

  6. #6

    Default Re: Leaking windscreens on 450's - cause Discovered?

    My box was a gift. Half of nothing at all would be cheap indeed!
    2004 Smart Fortwo Passion Cabro, low miles, commuting scoot.
    2016 Kia Sportage 1.7 diseasel, family wagon.
    1991 Yamaha FZR600 3HE7 Kocinski edition, owned since new.
    8 x bicycles. What can I say, I like bikes!

  7. #7
    Join Date
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    over here
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    Default Re: Leaking windscreens on 450's - cause Discovered?

    Quote Originally Posted by tolsen123 View Post
    A roll of rubber 70 cm wide

    Looks like 4 feet wide to me
    fq101.co.uk

  8. #8
    Join Date
    Nov 2017
    Location
    Stockport, Manchester
    Posts
    75

    Default Re: Leaking windscreens on 450's - cause Discovered?

    I have this exact problem....

    Was going to get the windscreen refitted as surely it means the bonding has gone. Not sure how structural the screen is on these but I'd imagine it's better properly bonded.

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