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BETTER ADHESION PRODUCTS FOR VARIOUS PLASTICS

 
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  • 1 Post By _PTGT03
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Old 28 Sep 2019, 05:29 pm
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Default BETTER ADHESION PRODUCTS FOR VARIOUS PLASTICS

What may I be missing here?

Just the name "JBWeld" used to conjure up thoughts of a an especially strong adhesive bond.

But, when I look at a store with a really good selection of adhesives, JBWeld is just a "brand" name, with all kinds of adhesives that are already on the market - like two-part epoxy, and gasket Silicone.

When I finish my Morette headlight project, I am going to need a really strong and dependable bond between the Morette Urethane and the OEM plastic plastic mounting screws.

Do I need to consider a plastic welder first; reinforced by epoxy?
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Old 28 Sep 2019, 06:20 pm
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Default Re: BETTER ADHESION PRODUCTS FOR VARIOUS PLASTICS

Plastic Welder
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Old 28 Sep 2019, 07:33 pm
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Default Re: BETTER ADHESION PRODUCTS FOR VARIOUS PLASTICS

You best decision making process will be to determine the types of plastics to be joined, and then call or email the technicians' from 3M, Lord-Fuser, and other popular industrial adhesive manufacturers.
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Old 28 Sep 2019, 08:26 pm
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Default Re: BETTER ADHESION PRODUCTS FOR VARIOUS PLASTICS

I would determine what plastics are involved. Plastic fasteners are often Nylon. Molded plastic parts are often (but not always) ABS. Parts in the polyolefin family (Nylon, polyethylene, polypropylene, etc.) are notoriously hard to bond. And of course you mention urethane, i.e. polyurethane. It has it's own issues due to flexibility. Plastic parts are often marked with a recycling triangle that has a letter code indicating the plastic type.

Google it, for example "adhesive for polyurethane". There's a lot out there.

Sourcing the adhesive; maybe a hardware store will carry what you're looking for, but more likely an industrial supply will be needed. I'd recommend McMaster-Carr www.mcmaster.com I deal with them regularly at work. Their site includes informative pages, e.g. "About Structural Adhesives".

Just be aware that as you get into industrial 2-part adhesives they come in a dual barrel cartridge that requires a separate plunger, gun and nozzle for dispensing. That could get a little pricey. It may be possible to rig something up to pump out the adhesive and mix it in a small container by hand, but I never tried that.
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Old 28 Sep 2019, 10:17 pm
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Default Re: BETTER ADHESION PRODUCTS FOR VARIOUS PLASTICS

I go through this all the time and have given up on calling and talking to the so called technicians at these chemical supply companies.

The best advise is try an area with the parts you will be using.

I recently repair a poly plastic stock air box housing (see thread: http://www.ptcruiserlinks.com/forum/...tml#post707736 ) and was told JB would not bond to it. Hmmm Not only did it bond to it, I dried it for a fasner and painted the projects. It now looks like factory...well more or less.

I also was told years ago that the use of it to fill a void in a super charger would not be wise. Hmmm again bought the "JB weld in commercial quarts quantity and fill a supercharger housing area to increase the noise the Super Charge makes. This mod has now been copied and is frequently used for a couple decades with out any failure.

To be clear so I do not get misunderstood I have also used JB weld on some project and it will not stick at all. My soccer ball got a hole in it and the JB weld failed to seal it...

I also realized a new use for JB weld and that is a economical way to make molds of some parts and then use other material like fiber glass to actually make the new part.

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Last edited by NitroPT; 28 Sep 2019 at 10:20 pm.
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Old 29 Sep 2019, 12:39 pm
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Default Re: BETTER ADHESION PRODUCTS FOR VARIOUS PLASTICS

Quote:
Originally Posted by NitroPT View Post
I go through this all the time and have given up on calling and talking to the so called technicians at these chemical supply companies.

The best advise is try an area with the parts you will be using.

I recently repair a poly plastic stock air box housing (see thread: http://www.ptcruiserlinks.com/forum/...tml#post707736 ) and was told JB would not bond to it. Hmmm Not only did it bond to it, I dried it for a fasner and painted the projects. It now looks like factory...well more or less.

I also was told years ago that the use of it to fill a void in a super charger would not be wise. Hmmm again bought the "JB weld in commercial quarts quantity and fill a supercharger housing area to increase the noise the Super Charge makes. This mod has now been copied and is frequently used for a couple decades with out any failure.

To be clear so I do not get misunderstood I have also used JB weld on some project and it will not stick at all. My soccer ball got a hole in it and the JB weld failed to seal it...

I also realized a new use for JB weld and that is a economical way to make molds of some parts and then use other material like fiber glass to actually make the new part.

Thanks to everyone for the recommendations.
I do believe in testing adhesives before actually "doing" it!

Nitro!
Again, you just throw out the term "JBWeld", but you don't specify what JBWeld product!!! Two-Part EPOXY????

AND....
It just dawned on me that as a licensed provider, I can actually order some dental lab polymethylmethacryclate.
We use it to add the powder to the liquid to make dental impression trays, and control the amount and setting time.
I have used it for all kinds of repairs around the house, and it is hard plastic.
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2003 PT Cruiser GT Panel Van Conversion as new day driver.

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Last edited by soonercruiser; 29 Sep 2019 at 12:42 pm.
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Old 29 Sep 2019, 01:05 pm
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Default Re: BETTER ADHESION PRODUCTS FOR VARIOUS PLASTICS

Quote:
Originally Posted by soonercruiser View Post
Thanks to everyone for the recommendations.
I do believe in testing adhesives before actually "doing" it!

Nitro!
Again, you just throw out the term "JBWeld", but you don't specify what JBWeld product!!! Two-Part EPOXY????
Like you "we" you and I have been using JBWeld all the way back in the 70's sold by JC Whitney... so when I say JBWeld it is the 2 part original epoxy.

Sorry for the confusion.... I still forget that these days no one company seems to be original anymore.....



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