430 - Crack / hole repair in plastic under tray | FerrariChat
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430 Crack / hole repair in plastic under tray

Discussion in '360/430' started by Mario Andretti, Apr 29, 2024.

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  1. Mario Andretti

    Mario Andretti Formula 3
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    #1 Mario Andretti, Apr 29, 2024
    Hi all,

    I remember seeing some handy people here repairing the plastic undercover with fiberglass kits and resin and stuff... I managed to hit something under the car and put a big hole in my big plastic (rear) under tray.

    What is the best thing I can use?

    Thank you
     
  2. Sj_engr

    Sj_engr Formula 3

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    dc
    #2 Sj_engr, Apr 29, 2024
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  3. Mario Andretti

    Mario Andretti Formula 3
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    #3 Mario Andretti, Apr 29, 2024
    Would this work also ?

    https://www.amazon.com/Fiberglass-Repairing-Resurfacing-Rebuilding-Hardener/dp/B000BO9NOO/ref=sr_1_6?dib=eyJ2IjoiMSJ9.tb7OAmpAvKQkYf_MtIA7RSav6ZvLJZzf7lBa_MJM-ZXpGHPs8_cYcBp7BeiFoevlNcrFvqgxDFJl23ZOymINNj8fN7hFb07Pl-cspvFhJjwlnVyWiIKtKE0XkQIaPbGs8-jM4Qv5_xrxXf92Nj6wPutv4nauRd6pvHsReAhdM3ScrEQdveyXgI7vNhaZBuYKx2y33fZOEeT0kJbMrXWMTNzzH7FwFnieoDievlHHKzzq_74iYR53SqIKse-9LnjUFS0E3STxd-xhu_XRxR-iZPAcT-0X7wNZsPgsU9YXQCs.G2Xcd73K_90xmd-eW4akuknPfKMRnsadaoSW2HoC2Vs&dib_tag=se&keywords=fiberglass%2Brepair%2Bkit&qid=1714401359&sr=8-6&th=1
     
  4. Sj_engr

    Sj_engr Formula 3

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    #4 Sj_engr, Apr 29, 2024
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  5. colorfull

    colorfull Formula 3
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    #5 colorfull, Apr 29, 2024
    Not really versed in this, but when I repaired mine, looked into it a bit, just note the tray is not made of fiberglass, I'm not exactly sure what the material is but it is some kind of plastic, so I would stick with products designed for plastic repair.

    I used a sheet of ABS plastic and JB Weld to effect repairs, worked very well
     
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  6. Mario Andretti

    Mario Andretti Formula 3
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    #6 Mario Andretti, Apr 29, 2024
    On my undertray, I can clearly see strains of fiber going through as the hole was ripped....Maybe different years had different materials used? Or is it just a core of fiber of some kind with plastic layered on it ?
     
  7. colorfull

    colorfull Formula 3
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    #7 colorfull, Apr 29, 2024
    I think this is exactly what it is, not straight plastic as that cracks too easily, it's just as you state, some kind of ABS but with material in it for reinforcement

    You can't make it out too well in this pic, but I remember when I repaired the cracks, there was definitely something in the center


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  8. Mario Andretti

    Mario Andretti Formula 3
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    #8 Mario Andretti, Apr 29, 2024
    Yes, that's what mine looks like, I'll take a pic when I go back in the garage (installing headers now :) )
     
  9. GogglesPisano

    GogglesPisano F1 Rookie
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    #9 GogglesPisano, Apr 29, 2024
    Likely a CFRP or which is common in the industry. That's carbon fiber reinforced plastic. There's also a glass fiber version. It's usually either injection molded or pressed.
     
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  10. David Copeland

    David Copeland Karting

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    #10 David Copeland, Apr 29, 2024
    Had to repair/replace some of the attachment tabs and cut replacement tabs from a carbon fiber panel and added threaded inserts. Attached with JB Weld and glass cloth to distribute the load over a larger surface. Should rough up attachment surfaces for good adhesion. Has held up great for 5 years and counting.


    Sent from my iPhone using FerrariChat
     
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