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  • Fab Question

    Ok, I just finished my first install and the piece I made began to crack, big time. It's an 03 Accord, and I mounted the screen where the center vents used to be. Similar to this guys:
    [media]http://www.mp3car.com/vbulletin/attachments/fabrication/45958d1193886835-2003-honda-accord-carputer-fab-pics-08-16-07_1149.jpg[/media]

    Now it's practically falling apart. My question is, if I get it to hold together, can I just cover the mold with some cloth and fiberglass it? This would keep me from starting over and would keep it looking the same since I was quite happy with it. Does anyone think this would be a bad idea? I feel like it would use my current mold as a mold for the fiberglass, but I've never worked with this stuff before.
    03 Accord Sedan CarPC

  • #2
    Please tell me you didnt make the structure out of bondo...

    What did you use?
    Fusion Brain Version 6 Released!
    1.9in x 2.9in -- 47mm x 73mm
    30 Digital Outputs -- Directly drive a relay
    15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
    Buy now in the MP3Car.com Store

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    • #3
      I made a "frame" out of JB weld and plexi glass, thinking that would be a fairly strong base. I knew not to make it entirely from Bondo. I did use Bondo to make the curves of the final shape.

      Edit: Surprisingly, It's not the spots where the Bondo is that's cracking. It's the corners where the Plexi glass is held with JB Weld. I'm having a hard time believing this stuff can fix an engine block if it can't hold 2 piece of plastic together.
      03 Accord Sedan CarPC

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      • #4
        were they different types of plastic?

        anyways, you say you put it where the vents were. Did you plug those vents or is there constantly varying temperatured air blowing accross it? I dont see a problem unless you are cranking the AC though, but it could be a problem if the variations in temperature vary too greatly.
        Fusion Brain Version 6 Released!
        1.9in x 2.9in -- 47mm x 73mm
        30 Digital Outputs -- Directly drive a relay
        15 Analogue Inputs -- Read sensors like temperature, light, distance, acceleration, and more
        Buy now in the MP3Car.com Store

        Comment


        • #5
          The plexi glass was all cut from the same piece, so no it was the same plastic. But where the plexi meets the old dash piece seems to hold very strong.
          Yeah, the vents are plugged.
          03 Accord Sedan CarPC

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          • #6
            I was also thinking of maybe melting the plexi glass together somehow. I would guess a plastic welder would work, but I don't own one. I'm also thinking of somehow redoing the corners (which is where it's cracking) to have more JB weld there.
            03 Accord Sedan CarPC

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            • #7
              Is it cracking because the JB Weld epoxy isn't gripping the plexiglass? If that's the case, you might try drilling holes in plexi so the JB Weld can go all the way through it and form bars that lock them together.
              .
              If just enough is really good, then too much ought to be perfect.

              2006 Scion xB with in-dash Atom & Lilliput 889GL -- Worklog at http://www.mp3car.com/vbulletin/work...res-links.html
              .

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              • #8
                Never thought of anything like that. Sounds like a good idea. I'll give it a try.
                03 Accord Sedan CarPC

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                • #9
                  I dont know why you used JB weld on plastic
                  Brian @Nexations Creations

                  Specialist in Custom Interior Fiberglass OEM Replication Work.

                  AIM: Exus28
                  E-Mail: [email protected]

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                  • #10
                    he probably read this:

                    JB Weld Website
                    Originally posted by JB WELD
                    What does it bond to?

                    Virtually any combination of iron, steel, copper, aluminum, brass, bronze, pewter, porcelain, ceramic, marble, glass, PVC & ABS, concrete, fiberglass, wood, fabric, paper -- just about any porous and non-porous material.
                    And thought that it would bond well.

                    Plexi is a hard material to use with those kind of products. ABS would have been better. A better solution would be an epoxy made to use with the plexi.
                    2007 Chrysler PT Cruiser TE
                    Car PC Progress:
                    Planning.......[---------X-] 95%
                    Parts...........[---------X-] 90%
                    Fabrication...[---------X-] 90%
                    RR Skin........[---------X-] 95%
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                    • #11
                      Right it might be strong as steel, but that is worthless if used on plastic properties. CA Glue or Duramix 4040 is really the answer.
                      Brian @Nexations Creations

                      Specialist in Custom Interior Fiberglass OEM Replication Work.

                      AIM: Exus28
                      E-Mail: [email protected]

                      Comment


                      • #12
                        Originally posted by blackcobra487 View Post
                        My question is, if I get it to hold together, can I just cover the mold with some cloth and fiberglass it? This would keep me from starting over and would keep it looking the same since I was quite happy with it. Does anyone think this would be a bad idea? I feel like it would use my current mold as a mold for the fiberglass, but I've never worked with this stuff before.
                        If it's just surface cracks, then you would be fine doing that. If it's structural cracks then you will have to redo it, otherwise it will fail later down the road.
                        2007 Chrysler PT Cruiser TE
                        Car PC Progress:
                        Planning.......[---------X-] 95%
                        Parts...........[---------X-] 90%
                        Fabrication...[---------X-] 90%
                        RR Skin........[---------X-] 95%
                        View my
                        Worklog
                        Road Runner Skins
                        Website
                        Favorite thread EVER!

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                        • #13
                          Post pictures, most likely they are structural cracks unless you really have the bondo piled up and they are just surface cracks
                          Brian @Nexations Creations

                          Specialist in Custom Interior Fiberglass OEM Replication Work.

                          AIM: Exus28
                          E-Mail: [email protected]

                          Comment


                          • #14
                            Yeah, I have to agree with these guys. My idea of drilling holes might be interesting, and could -- theoretically -- work. But if the JB Weld isn't grabbing onto the plexiglass, then I'd follow their advice and choose another material. Yep, it's extra work. But I bet you'll be happier in the long run.
                            .
                            If just enough is really good, then too much ought to be perfect.

                            2006 Scion xB with in-dash Atom & Lilliput 889GL -- Worklog at http://www.mp3car.com/vbulletin/work...res-links.html
                            .

                            Comment


                            • #15
                              The holes thing would work sort of, and would create a better mechanical bond, but you'll want a chemical bond to prevent temperature cycle damage and retain flexibility.
                              It would be a little work, but I think rebuilding the whole piece the right way would be better than having to redo the one you have now.
                              2007 Chrysler PT Cruiser TE
                              Car PC Progress:
                              Planning.......[---------X-] 95%
                              Parts...........[---------X-] 90%
                              Fabrication...[---------X-] 90%
                              RR Skin........[---------X-] 95%
                              View my
                              Worklog
                              Road Runner Skins
                              Website
                              Favorite thread EVER!

                              Comment

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