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Fiberglass bonding materials

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  • Anthony M.
    Expired
    • September 30, 2001
    • 58

    Fiberglass bonding materials

    I am in the process of repairing the exhaust tip surround on my 70 Coupe. I have acquired the correct used bonding strip for the repair but it still has some old fiberglass still attached. I have 2 questions to start.
    1. What is the best way to remove the old fiberglass and associated bonding material from the bonding strip? Is there a release agent to use or is grinding it off the best method?
    2. Since this is a small repair what is the best way to bond the strip to the fiberglass? I can't see spending a whole lot of $ for Lord Fusor bonding marterial and gun for such a small repair.
  • Chuck S.
    Expired
    • April 1, 1992
    • 4668

    #2
    Re: Fiberglass bonding materials

    Originally posted by Anthony Merendino (36824)
    I am in the process of repairing the exhaust tip surround on my 70 Coupe. I have acquired the correct used bonding strip for the repair but it still has some old fiberglass still attached. I have 2 questions to start.
    1. What is the best way to remove the old fiberglass and associated bonding material from the bonding strip? Is there a release agent to use or is grinding it off the best method?
    2. Since this is a small repair what is the best way to bond the strip to the fiberglass? I can't see spending a whole lot of $ for Lord Fusor bonding marterial and gun for such a small repair.
    One method is to drive a thick bladed putty knife into the bond and use chisels to gradually wedge the two pieces apart. My experience is the break never goes the way you want it too, particularly if you have a small part that's hard to hold. Grind it off the scrap using a 36 grit disc...you'll have much more control over the result.

    Unless the part is later SMC material, you don't need to use Fusor. If it's the black polyester-based fiberglass that was original for your 70, you can get the original style bonding adhesive from The Corvette Image. If the part or the bonding strip is SMC, you don't really have a choice...Fusor or equal is the only type adhesive that works for SMC.
    Last edited by Chuck S.; October 16, 2008, 11:37 PM.

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    • Harmon C.
      Extremely Frequent Poster
      • August 31, 1994
      • 3228

      #3
      Re: Fiberglass bonding materials

      If you buy the lord fusor and gun you can use it for a couple years to do lots of bonding repairs around the house and other parts on cars where you need a repair as it will glue together anything. For most jobs I don't use the mixing tube. Save the plugs and the cap that are in the tube when new and just put what you need for the job on cardboard and mix it with a screwdriver. Replace the caps and keep the caps on the same side or they will never come out.
      Lyle

      Comment

      • Anthony M.
        Expired
        • September 30, 2001
        • 58

        #4
        Re: Fiberglass bonding materials

        Thanks for the replies. I was able to seperate the old fiberglass and grind off any residual bonding adhesive so now I have a nice clean bonding strip to work with. The piece I have is indeed the original black polyester based fiberglass so I will look for the bonding materials suggested.

        Comment

        • Jim T.
          Expired
          • March 1, 1993
          • 5351

          #5
          Re: Fiberglass bonding materials

          When I did a repair job replacing/repairing fiberglass 22 years ago I used a bonding product for fiberglass off the shelf at the paint/auto parts store. Don't recall the name of the product at the moment, however it had held up well, still no separation, lines or any tell-tell visuals that the repair was done. My first application of the bonding product was firming to fast because I used to much hardener, pulled the piece off and prepared it again for a successful application.

          Comment

          • Mike M.
            Director Region V
            • August 31, 1994
            • 1463

            #6
            Re: Fiberglass bonding materials

            It sounds like you may have some spare scrap Fiberglas.
            Again, I would suggest a few test bonds for formula, application thickness curing and strength.

            HaND

            Comment

            • Mike M.
              Director Region V
              • August 31, 1994
              • 1463

              #7
              Re: Fiberglass bonding materials

              I should mention, remember your rubber gloves.
              If you have mixed-in too much hardener, it could begin to set-up immediately. It can then create a lot of heat while curing.
              If you get this activated bonding agent on your skin, it could cause burns.
              HaND

              Comment

              • Anthony M.
                Expired
                • September 30, 2001
                • 58

                #8
                Re: Fiberglass bonding materials

                Thank you gentlemen. I am going to an auto body supply shop today to see what they have and recommend.

                Comment

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