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Old 05-18-2021, 08:01 AM   #16
Frame Maker
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As soon as fiberglass, epoxy, and other materials entered the conversation OP has left the room... but feel free to discuss quietly amongst yourselves.
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Old 05-18-2021, 10:48 AM   #17
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I just did this repair Julian. Because a smart dude (you) once told me to use ABS cement for ABS repairs. Sorry, no plastic welding.










youtu.be/UeaerRuYspg
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Old 05-19-2021, 11:22 AM   #18
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Old 05-25-2021, 04:54 PM   #19
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Back in college I had a job making product and engineering models. We always used MEK to solvent bond ABS. I have also used acetone and methylene chloride to bond ABS plastic. It melts the plastic and allows the polymer chains to "tangle" together and when the solvent evaporates everything solidifies in a, hopefully, strong joint.

Use care to keep the solvent confined to the mating surfaces only. I was taught to hold the plastic parts together then used a hypo bottle to let the solvent wick into the crack with capillary action. Be careful around cosmetic surfaces, a splash will cause damage immediately. Also, more isn't necessarily better just enough to wet the surfaces and soften them. Let rest for at least 12 hours so all the solvent can evaporate.

If I had to mend a fairing I'd solvent bond the joint and let it cure for 24 hours. Then reinforce with fiberglass cloth: roughen up the inner surface with 120 grit sandpaper, remove all dust, apply a layer of JB Weld Plastic epoxy, smooth in some fiberglass cloth, then cover with a final coat of epoxy.
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Old 05-25-2021, 06:08 PM   #20
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I used to use MEK as it does this job really well.

However, it seems MEK is no longer sold I'm California.

Acetone works but doesn't seem to work as well as MEK
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Old 05-25-2021, 06:24 PM   #21
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Best to repair something with the same material if you can. It generally works best. And solvents work as well. Or an adhesive of he same basic composition as the original material.
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Old 05-25-2021, 08:51 PM   #22
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Quote:
Originally Posted by stangmx13 View Post
I use 1-2 layers of fiberglass on the backside to reinforce glued ABS joints. I've never tried plastic welding because that solution worked so well.
I fixed track plastics with sanding the ABS on the back of both sides and using material from a sock soaked in two part epoxy. It never came apart till the next time I crashed.
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Old 05-26-2021, 09:21 AM   #23
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Originally Posted by stangmx13 View Post
No resin. I lightly sanded the ABS. Apply a layer of ABS cement, lay down fiberglass, and saturate the fiberglass with more ABS cement. Thatís it. I used the black ABS cement from HomeDepot which I think has a lot of ABS in it.
I too have done exactly this with great results including reconstructing large swaths of missing area from original bodywork. Worked great and held up well.
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