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Discussion Starter · #1 ·
Working on a project that uses nylon washers to reinforce hold down pegs on a polycarbonate shell for an remote control car. It is easy to loose the nylon washers as the shell is removed often by my grandkids to charge the batteries. Is there a glue that will hold these two very dissimilar materials together? I am able to get a decent grip on the shell with either super glue or epoxy but the nylon washers seem to pop loose almost immediately. Mostly used in mild weather so temperature swings do not seem to be an issue.
Mike
 

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I saw an epoxy at our Home Hardware chain a few years ago that should work but it was a little pricey at $20 a kit. You didn't say how strong a bond you need. The contact cement might work as that is a pretty strong solvent in it and it might bite into the nylon. Maybe double sided carpet tape might work if you just want if a weak bond is okay.
 

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Theo
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Or make washers out of the same stuff as the shell.
 

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Shoe goop....
 

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Re the 'Robber cement`, 'Contact cement'.
Charles made a comment re the solvent biting into the nylon. I realized that I don't really understand the physics of why it bonds to a wide range of substrates, as a separate issue of why the two glued surfaces bond to each other.
I'm pretty sure the solvent isn't part of the process...it's there to keep the rubber in suspension/solution until the solvent flashes off. The cement will bond to just about any non-porous, as well as porous surfaces. Maybe someone can explain why at a molecular level it does that?
https://en.wikipedia.org/wiki/Rubber_cement
https://home.howstuffworks.com/uses-for-contact-cement.htm
 

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I’m wondering about the glue for ABS or PVC ?
Not really 'glue' in the adhesive sense, Rick. It works by chemically melting and welding two similar plastic compounds together. That's why there's so many different PVC and ABS types available; the chemistry is very specific to the type of plastic.
 

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Rick
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I’m aware . I’m thinking the melting action may keep it together. But who knows
 

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You might have a point, Rick. Methylene Chloride is used for welding polycarbonate sheets. No idea what it would do to nylon?
 

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I would try plain ole caulk...probably silicone...a little dab'll do ya...

If you own a boat, Boat Life...

The black window adhesive should also work...

...and if all else fails, try nail polish...pick a nice color...:grin:
 

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Rick
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Geez I got it. It’s expensive,but it’s called Kerdi fix by schluter . I used it on my shower alcove in places . It hardens like a plastic. I’d sand these washers though , just to provide something for it to adhere to .
It’s gotta be the stickiest substance I’ve ever worked with. Even rips apart latex gloves


 

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I tried looking it up again and saw two suggestions. Silicone caulk like Nick suggested and hot melt glue. The article said that nylon melts easily and the hot glue will melt it enough to stick. It said rough the surface up first on both methods.

There are a lot of different ways that glues work. Some of the specialty ones actually form a molecular bond. Most just bond into the pores in the surface of the material. Wood glue soaks into the cells a bit too. Like Dan said, pvc and abs glues slightly dissolve the surfaces of the connection and weld the two pieces together. I've seen plastic piping in the oil patch joined by spinning the connector on the pipes at high speed which softens the surfaces enough to heat weld them together.
 

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My first thought was hot melt glue, although without roughing up the surface of the nylon, I'm not sure it will hold very well. But I wasn't thinking you wanted it to stick together forever. The other thought I had was what Stick mentioned, shoe Goop. It's used to adhere a synthetic sole to either a leather or even rubber sole. Waterproof, sticks forever. I always have my new shoes re-soled this way and they just last forever. Actually had a pair where the top wore out before the sole.
 

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Discussion Starter · #17 ·
I have tried super glue in several mixes, epoxy, hot melt glue, and Gorilla Glue. Tried roughing up the nylon washers, even scored one with a rasp, and etched it with acetone. In every case the glue held onto the polycarbonate but the washer broke loose. Will try some of the other suggestions. I sure never would have thought of Shoe Goo! Thanks for all the ideas, will let you know if something works.
 

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Paul
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Maybe hot-melt. I successfully glued low density poly with it, which is fairly hard to glue.
 
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