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HelicopterOff Topics › Can JB Weld bond plastic?
02-21-2011 03:34 AM  6 years agoPost 1
rudyy

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E. Amherst, NY

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I am putting a plastic model giant robot kit together and I by mistake break one of the plastic pieces. To my surprise, the CA glue does not work. I have not got JB Weld in hand yet but will that work great for plastic in this situation?

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02-21-2011 05:21 AM  6 years agoPost 2
Justin Stuart (RIP)

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Plano, Texas

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Have you tried an accelerator with the CA? That's the trick when gluing plastic. You can make a homemade accelerator with baking soda and water which will make the CA set too, but genuine CA accelerator is much, much better.

As for JB-Weld, I have yet to find a substance it will not bond. Metal, plastic, brick, carbon fiber, wood. It will bond to all of them.

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02-21-2011 06:45 AM  6 years agoPost 3
helo_chris

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goodlettsville, tn

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It will pretty much bond anything as Justin said, you have to be careful because it can melt some plastics as it hardens. And CA typically only works on porous surfaces, thats how it bonds. It doesnt bond well to smooth, non-porous surfaces.

"There is a fine line between cutting edge and bleeding edge.."

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02-21-2011 02:34 PM  6 years agoPost 4
Dood

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Wescanson

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JB Weld, per the website, will not bond to either Polypropylene plastic or Polyethylene plastic. These plastics together account for nearly every consumer use of plastic.

See the FAQ page
http://jbweld.net/faq.php

I think you should use a specialized epoxy for use with plastics.

Or, if you want a REALLY GOOD, clean bond, use that Tech Bond stuff that the guy at IRCHA sells every year.

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02-21-2011 02:59 PM  6 years agoPost 5
Brokenlink

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Oakdale

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I have not yet seen a thing that JB weld would not stick to.

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02-21-2011 04:17 PM  6 years agoPost 6
Justin Stuart (RIP)

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Plano, Texas

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JB Weld, per the website, will not bond to either Polypropylene plastic or Polyethylene plastic. These plastics together account for nearly every consumer use of plastic.
There is almost nothing that will bond to polypropylene or polyethylene. There is a product called ScotchWeld 8005 which costs $50 for a 10ml tube that will bond to these "low surface energy" plastics. There may be a few other adhesives as well. This is the kind of plastic the Pelican cases are made of and it has properties very similar to Teflon. You can compare the chemical structure of polyethylene on the left with Teflon on the right:

But there are thousands of other formulations of plastics in common use, and many of them are easily bonded by CA or JB Weld.

I glue plastic all of the time using CA + accelerator. It works fine for most plastics. CA does not need a porous surface to bond to. It needs certain conditions to set (i.e. the presence of a hydroxyl group or something else to start the chain reaction), but once it is activated it will bond to many surfaces, both porous and nonporous. Sure, CA won't bond very well to things like tempered glass, but it will stick somewhat.

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02-21-2011 04:17 PM  6 years agoPost 7
pphil611

rrApprentice

South Dakota

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bonding

JB is probably not your best bonder for plastic.
I think I would use Shoo-Goo, Goop, Shoe-Goop. Comes with various names but bonds to nearly anything, I've even sealed plane fuel tanks (nitro)for a temperary fix. You can get it at nearly any hardware store, even K-Mart.

Spectra-G, MAH, CSM

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02-21-2011 04:19 PM  6 years agoPost 8
Dood

rrProfessor

Wescanson

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There is almost nothing that will bond to polypropylene or polyethylene
Tech Bond does. I link to it in my previous post. If you walked down vender's row at IRCHA, you saw a guy doing live demos of the stuff. It's a pretty amazing substance.

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02-22-2011 12:04 AM  6 years agoPost 9
GREYEAGLE

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Flat Land's

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What type of plastic ?

Can you identify the type of plastic ??? If it's a form of injected molded styrene - ABS, you maybe able to weld it back to a structural solid.

Try to locate a scrap or tidbit off one of the original molding tree's and test it with just a whisper of straight acetone - a wee drop off a tooth pick.

If it look's like it melts your in business !

Jig the tab or broken piece back together and wick a touch of it to the crack and walk away till it gasses completely off and re set's.

greyeagle

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02-23-2011 04:23 AM  6 years agoPost 10
dlflyer

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Flushing, Michigan

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Whats wrong with Model Masters Model Cement? The black label is thin like CA. Wicks in and dries pretty fast.

We have a Great country Because we have Great People

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02-23-2011 05:24 AM  6 years agoPost 11
burntclutch

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Israel

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