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Old 05-16-2021, 11:09 AM   #1
Frame Maker
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ABS repair... ABS cement vs plastic welding?

This question is specifically for those with actual experience repairing plastic panels...

I have had good results repairing broken ABS body panels using ABS cement. I also know that plastic welding is also a common method for repairing many types of plastic including ABS, but I have not tried it. I would like to know if anyone has experience using both methods for repairing ABS and which method had better results (better strength and less likely to crack again)?

Thanks.

Last edited by Frame Maker; 05-16-2021 at 11:12 AM..
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Old 05-16-2021, 11:53 AM   #2
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I like to plastic weld. But I find the plastic rods dont work as well as
The actual fender plastics..so I use a spare fender or I cut a piece from a sacrificial area and use that.
This also works better to color match.
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Old 05-16-2021, 01:20 PM   #3
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Originally Posted by buellistic View Post
I like to plastic weld. But I find the plastic rods dont work as well as
The actual fender plastics..so I use a spare fender or I cut a piece from a sacrificial area and use that.
This also works better to color match.
Has your plastic welding experience included ABS? and do you find plastic welding to be more reliable than using ABS cement? I'm looking specifically for comparison between the two methods. Thanks.
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Old 05-16-2021, 02:21 PM   #4
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Originally Posted by Frame Maker View Post
Has your plastic welding experience included ABS? and do you find plastic welding to be more reliable than using ABS cement? I'm looking specifically for comparison between the two methods. Thanks.
I have found on bikes the cement gives up with vibrations sooner.
But on sewer pipes, works great.

I bought this Mac kit over 15 year's ago. Still works..
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Old 05-16-2021, 02:28 PM   #5
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I have found on bikes the cement gives up with vibrations sooner.
Thanks for the info
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Old 05-16-2021, 10:35 PM   #6
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I've never used it on a motorcycle body panel (yes I read the OP), but I have used acetone on ABS 3D-printed parts with great luck. It melts the base material and creates a chemical bond.
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Old 05-17-2021, 02:48 PM   #7
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I've had really good luck gluing ABS panels back together using ABS glue and adding a reinforcing layer of ABS.
You can buy the ABS glue at Lowe's or home Depot and as long as you remove the paint from the surface you are gluing the ABS glue basically melts the two pieces together.
Adding another layer of ABS plastic over the repair adds another layer that is molded on for more support. You can buy the ABS plastic at the plastic supply stores and remnant chunks.
I bought a plastic welding kit and it works but it doesn't hold up as well as the glue does. Or at least not in my experience.
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Old 05-17-2021, 02:55 PM   #8
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Originally Posted by motomania2007 View Post
I've had really good luck gluing ABS panels back together using ABS glue and adding a reinforcing layer of ABS.
You can buy the ABS glue at Lowe's or home Depot and as long as you remove the paint from the surface you are gluing the ABS glue basically melts the two pieces together.
Adding another layer of ABS plastic over the repair adds another layer that is molded on for more support. You can buy the ABS plastic at the plastic supply stores and remnant chunks.
Yep, I've done exactly this many times and have also had good results

Quote:
Originally Posted by motomania2007 View Post
I bought a plastic welding kit and it works but it doesn't hold up as well as the glue does. Or at least not in my experience.
This is the part of the equation that I've been lacking. Thanks for the info.
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Old 05-17-2021, 03:39 PM   #9
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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.
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Old 05-17-2021, 04:04 PM   #10
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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 have tried fiberglass resin and fabric to reinforce the repair but every time I tried, it did not adhere well and eventually started peeling off.

I know others that do it and say the get good results.

What do you do to prep the surface?
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Old 05-17-2021, 05:03 PM   #11
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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 have tried fiberglass resin and fabric to reinforce the repair but every time I tried, it did not adhere well and eventually started peeling off.

I know others that do it and say the get good results.

What do you do to prep the surface?
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If you are not having fun riding a motorcycle, you are doing it wrong.

The best performance upgrade is upgrading the operating system of the operator. It is cheap, easy, fast, safe and works on every bike you will ever ride.

I am also a Patent Attorney so if I can help you with any IP matters, please just ask.
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Old 05-17-2021, 05:53 PM   #12
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I use epoxy and fiberglass cloth. You're right about fiberglass resin not sticking well on plastic. I usually use super glue on the crack to hold it in place, rough the surface with sand paper, then a layer of two part epoxy (JB weld or similar), put the cloth in place and then layer on another coat of epoxy. I've used that method to reinforce mounting holes that have broken, and to repair cracks, etc. Another dodge I some times use when an entire mounting tab is missing, and it's in a non visible place when assembled is to make a clone mount out of sheet metal, and mount it with machine screws and epoxy.
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Old 05-17-2021, 08:31 PM   #13
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Quote:
Originally Posted by bobl View Post
I use epoxy and fiberglass cloth. You're right about fiberglass resin not sticking well on plastic. I usually use super glue on the crack to hold it in place, rough the surface with sand paper, then a layer of two part epoxy (JB weld or similar), put the cloth in place and then layer on another coat of epoxy. I've used that method to reinforce mounting holes that have broken, and to repair cracks, etc. Another dodge I some times use when an entire mounting tab is missing, and it's in a non visible place when assembled is to make a clone mount out of sheet metal, and mount it with machine screws and epoxy.
+1. Epoxy with fiberglass has lasted me for several years.
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Old 05-17-2021, 08:57 PM   #14
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No resin. I lightly sanded the ABS. Apply a layer of ABS cement, lay down fiberglass, and saturate the fiberglass with more ABS cement. That’s it. I used the black ABS cement from HomeDepot which I think has a lot of ABS in it.
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Old 05-18-2021, 05:36 AM   #15
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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 have done it that way a couple of times but usually, I just add a layer of ABS sheet as reinforcing
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If you are not having fun riding a motorcycle, you are doing it wrong.

The best performance upgrade is upgrading the operating system of the operator. It is cheap, easy, fast, safe and works on every bike you will ever ride.

I am also a Patent Attorney so if I can help you with any IP matters, please just ask.
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