Repairing a plastic grill

Mopar Body and Trim

  1. nearpar

    nearpar Well-Known Member

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    Got a decent used plastic grill for my 72 Dart.
    This grill has a couple of broken mounting points and a small crack on the bottom.i do have the broken tabs that I am looking to reattach. I was wondering what some of you may of successfully used to make these kind of repairs. I want to reattach the original tabs and repair the crack.

    Thank for your help
     
  2. cdwmotorsports

    cdwmotorsports Well-Known Member

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    I tried a good epoxy and it failed, but it was on the car and I left it unattended. I saw something shiny and went to work on it. I’m gonna try it again come summer. However I may just buy one of the new repop ones and be done.
     
  3. Alaskan_TA

    Alaskan_TA Well-Known Member

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    • Alaskan_TA

      Alaskan_TA Well-Known Member

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      Missing corner that is hollow inside?

      No problem.........

      missing grille corner 1.JPG

      missing grille corner 2.JPG

      missing grille corner 3.JPG

      missing grille corner 4.JPG
       
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      • cdwmotorsports

        cdwmotorsports Well-Known Member

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        Well I guess I’m gonna tackle a couple new projects this summer.
         
      • Alaskan_TA

        Alaskan_TA Well-Known Member

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        Round hole in a missing corner on a complex surface?

        Again, no problem. A straw works as an inner form for the hole;



        missing hole & corner 1.JPG

        missing hole & corner 2.JPG

        missing hole & corner 3.JPG

        missing hole & corner 4.JPG
         
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        • 4spdragtop

          4spdragtop Well-Known Member

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          JB Weld makes good stuff as well. I've used it on our 69 cuda grille and tail light lenses
           
          Last edited: Feb 10, 2020
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          • JDMopar

            JDMopar Well-Known Member

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            If you can find a parts grill that is busted all to pieces for dirt cheap, buy it! Then take plastic pieces from the same area you want to repair, and scrape shavings off of that piece into a cheap glass dish. Then add a little bit of Acetone to the shavings and mix it up till it makes a gooey paste. You can then apply that goop to the V'ed out crack, and dab it into the V. Let it dry and then carefully sand it down smooth. Use the same method to reattach your broken off tabs. If you do it right, it won't bust back loose. Experiment on some pieces of the parts grill if you find one.

            I edited my post to read "Acetone" instead of Toluene, because Mtrhead jogged my memory and he is correct. I guess too much paint thinner made me remember the wrong paint thinner....lol.
             
            Last edited: Feb 10, 2020
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            • Mtrhead

              Mtrhead Ace of Spades ♠️

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              Acetone & shaved plastic mix and apply..will harden to good as new
               
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              • jos51700

                jos51700 Well-Known Member

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                I've heard that model glue for polystyrene works well.
                 
              • Fgill

                Fgill Well-Known Member

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                If the breaks are in or have an area (such as underside) which is not visable, I have had great results with using fiberglass weave, drywall tape, etc. lay it down after the basic repair is done and 'flood' it with epoxy. allow to cure. sand. 50/50 Duco & Krazy glue works amazing without the heat that many epoxies throw off.
                Often times an area that is busted will also show micro cracks around that broken area and is probably brittle to begin with. Renforcing it will make the repair last a long time.
                If you need a parts 72 grill, lmk.
                 
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                • jazak5

                  jazak5 Well-Known Member

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                • TF360

                  TF360 Well-Known Member

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                  JB weld plastic epoxy. I had success with it
                   
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                  • mcodecuda

                    mcodecuda Senior Member

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                    I’ve used a product call Plast-Aid to fix the plastic grills on many 69 barracudas with great success.
                     
                  • moparmat2000

                    moparmat2000 FABO Gold Member FABO Gold Member

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                    If its cracked and all the pieces are there and fit well together, just use MEK (Methyl Ethyl keytone) available at lowes in the paint department on a cut down acid brush on the cracked plastic. Just 1 drop will suck into the crack via capillary action. And will melt the plastic at the crack rebonding it together with it's own plastic. No V notching needed. It takes about a day to fully dry to handling, but you can clamp it together on the back side with a piece of sheetmetal and clamps till dry. I glued these shattered things back together with it. Missing pieces I used JB weld.

                    20180217_161122.jpg

                    20180218_154934.jpg
                     
                    Last edited: Feb 10, 2020
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                    • nearpar

                      nearpar Well-Known Member

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                      Wow Thank you that is amazing.
                       
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                      • Howard1784

                        Howard1784 Well-Known Member

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                        This stuff: Plastifix and Q bond

                        01-00542.jpg
                         
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                        • JoePole1

                          JoePole1 A dude in a B body FABO Gold Member

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                          Thank you all for your repair experiences. I was debating about buying a beat up instrument panel to customize and paint non-stock. I'm going for it now.
                           
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                          • 4spdragtop

                            4spdragtop Well-Known Member

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                            I've got 2 beat up bezels if interested
                             
                          • JoePole1

                            JoePole1 A dude in a B body FABO Gold Member

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                            Thanks but it's for a 72 Rallye B-Body.
                             
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                            • nearpar

                              nearpar Well-Known Member

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                            • mcodecuda

                              mcodecuda Senior Member

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                              Plasticity looks to be the same as Plast-Aid except for the applicator. I use a glass eye dropper to add the activator to the powder when mixing Plast-Aid in bulk but I also like the needle type applicator with Plastifix so I’m ordering some today.
                               
                            • Mattax

                              Mattax Just the facts, ma'am FABO Gold Member

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                              Two different methods, 'welding' and bonding:
                              The chemicals best used for plastic welding depends on the plastic.
                              Some plastics can be welded with heat.
                              Some plastics can be bonded with adhesives (like epoxy) and some can't.

                              ABS is one of the more common plastics used for trim etc on cars.
                              More info in this thread
                              instrument cluster repair what glue to use
                               
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