C2 Spare Tire Tub Repair - NCRS Discussion Boards

C2 Spare Tire Tub Repair

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  • Dave K.
    Very Frequent User
    • November 1, 1999
    • 952

    C2 Spare Tire Tub Repair

    My 66 spare tire tub's front fiberglass is broken away. I'll need to repair about 12 in. of circumference at the front of the tub. The height of the ledge that requires repair is about 1 1/4 in. The thickness is about 3/16 in. I'm planning to use fiberglass mesh but I'll need to construct a mold to keep the wet mesh in place while it dries. Anybody have any ideas on how to construct such a mold and how to color the resin to achieve the dark gray coloring?

    Regards,
    Dave Kitch
    33108
  • Jim V.
    Expired
    • November 1, 1991
    • 587

    #2
    Re: C2 Spare Tire Tub Repair

    Hi Dave,

    You, I, and sooo many others have this issue. I have read you can tint the resin gray. HD, and I suspect all the paint stores, carry tint-in-a-tube which is added to the resin.

    Both my carrier and tub have road rash in the front. I have looked at the repro carriers and tubes but cant seem to cut lose with all that money.

    I was considering fabbing a "z" mold from light gauge metal (sill or stud used in construction and readily available at building stores). I would then clamp the mold to tub maintaining the necessary arc. Then layin the glass, and trim cut the bottom edge level with the existing edge.

    Hummm.......lets think about this.

    JimV #20146

    Comment

    • Gary S.
      Extremely Frequent Poster
      • July 31, 1992
      • 1632

      #3
      Re: C2 Spare Tire Tub Repair

      Dave, I repaired the spare tire tub on my non-judged 66 due to the same issues as you. I had two sections, roughly 12" +/- that needed to be built up and fixed. My repair probably would not meet your needs. My mold was simple - I used the edging that you see on Formica counter tops. IIRC, it is not quite 2" tall. I clamped a piece of this Formica trim on to the lip of the tub where the glass was still intact. I laid a piece of Saran Wrap on the face of this trim so that the glass or resin would not stick to it. It was clamped on both sides with two clamps on each end. Because I extended the Formica trim far enough around the good part of the lip, I got a natural curve that mimicked the curve of the tub. After that, it was just a matter of carefully applying glass and resin and building it up slowly. Once it was built up and properly cured, I used sand paper and a dual action sander to smooth the surface. I did NOT go with any pigment in my resin, relying on the non-approved method of a rattle can of paint. I even tried to wipe the paint off, after is was still tacky to hide the fact that it was painted. I will say that after quite a bit of work the results were more than satisfactory.

      I think that you will probably find that there isn't anything you can do, though, that will mask this type of repair and make it undetectable without losing some points in judging. Again, this was on a car that was never intended to be judged.

      Gary

      Comment

      • Rob A.
        Expired
        • December 1, 1991
        • 2126

        #4
        Re: C2 Spare Tire Tub Repair

        Bair's Corvettes sells the original black/grey colored bonding adhesive, which can be mixed with fiberglass strands(before adding the hardener). When it dries it can be lightly sanded as needed to produce the original black/grey color.

        Comment

        • Jim V.
          Expired
          • November 1, 1991
          • 587

          #5
          Re: C2 Spare Tire Tub Repair

          Rob,
          Do yo mean mix the bonding adhesive with the resin or with the glass mat (fiber)?

          JimV

          Comment

          • Dave K.
            Very Frequent User
            • November 1, 1999
            • 952

            #6
            Re: C2 Spare Tire Tub Repair

            Gary,

            Thanks for the reply. The tub doesn't come down for judging -- just the lid. Granted a judge will crawl under the car and look at the tub but my repair is at the front most of the tub and up against the body. If I do a good job of repair, I can't believe that I will lose more than 1-2 condition points.

            Dave Kitch

            Comment

            • Kevin M.
              Expired
              • November 1, 2000
              • 1271

              #7
              Re: C2 Spare Tire Tub Repair

              I was told adding black paint to the resin will do the trick.

              KEvin

              Comment

              • Jim V.
                Expired
                • November 1, 1991
                • 587

                #8
                Re: C2 Spare Tire Tub Repair

                I wonder if it matters what kind of black paint...lacquer, enamel, epoxy...

                Comment

                • John S.
                  Expired
                  • July 31, 1990
                  • 292

                  #9
                  Re: C2 Spare Tire Tub Repair

                  I have have fixed a few of them and have added black paint. I have put Trim black in it ( spray bomb ) they use it on bumpers, and I have put some Dupont Chroma Base tinting high strength black in it also. It will harden. Put alittle in at a time. john

                  Comment

                  • Bob R.
                    Extremely Frequent Poster
                    • June 30, 2002
                    • 1595

                    #10
                    Re: C2 Spare Tire Tub Repair

                    I repaired the lip of my tub in a couple of areas. One was 3 or 4 inches long. To get a form a used some plaster of paris. I covered a good section of the tub with plastic wrap and applied the plaster to it. Once hard it popped off easily. I then used the plaster as a form for the bad area. On close inspection you can tell the tubs been repaired but it did come out pretty good.

                    Comment

                    • Rob A.
                      Expired
                      • December 1, 1991
                      • 2126

                      #11
                      Re: C2 Spare Tire Tub Repair

                      Mix the bonding adhesive with the glass mat strands.

                      Comment

                      • Jim V.
                        Expired
                        • November 1, 1991
                        • 587

                        #12
                        That's Brilliant Bob!..... n/m *NM*

                        Comment

                        • Tracy C.
                          Expired
                          • July 31, 2003
                          • 2739

                          #13
                          Pattern shop trick that works every time....

                          Used a similar method to fix my heater box. You want to use some schellac and sanding sealer to seal up the plaster mold. Wax the snot out before putting it in place to start the glass work and it will separate easily from the repair when all done.

                          tc

                          Comment

                          • Gene B.
                            Very Frequent User
                            • May 31, 1990
                            • 144

                            #14
                            Re: Pattern shop trick that works every time....

                            The black pain works fairly well. I also took hemp rope and cut 1/2 to 3/4 inch strands and mixed in with the resin. The hemp rope strands match weel with the original strands in the orignal glass.

                            Also using the formica gives you a great form. Also cover the other side and clamp with another piece of formica to give it the press-molded appearance and saves a lot of work trying to match the smooth texture of the original tub. Small spring clamps press the two pieces of formica together works fairly well along the top and bottom of the repair.

                            Good luck!! I hope this helps

                            Gene

                            Comment

                            • Joe R.
                              Extremely Frequent Poster
                              • March 1, 2002
                              • 1356

                              #15
                              Re: C2 Spare Tire Tub Repair

                              Hi Dave:

                              At some point I have to address the same problem. One thing I have considered to find a damaged "donor" tub and remove an undamaged portion of the lip from that tub to use as an insert for the repair.

                              I don't know whether this would likely come out any better than fabricating the entire missing section from scratch, but it seems to have the potential of being less detectable once the tub is installed on the car.

                              Comment

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