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What glue can I use to stick silicone to plastic? Answered

Plastic is easy, lots of stuff sticks to plastic, but the only thing that seems to stick to silicone is more silicone. Hot glue, super glue, Elmer's glue, Gorilla glue, and liquid steel epoxy all fail. Any suggestions? Maybe something marine related? (Background: I used some left over silicone molding compound to make a comfy handle, but it doesn't want to stay on.)

Discussions

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steveastrouk

Best Answer 10 years ago

Silicone can be glued, but you often need a special "surface activator" chemical to prepare the silicone and the substrate to be bonded. People like Permabond and Loctite can do them.

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steveastroukStokestack

Answer 4 years ago

"Silpoxy" is one

http://www.smooth-on.com/Epoxy,-Silicone-an/c11_1189/index.html?osCsid=rroncsv8o31mujcl356i421do5

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Erik K

4 months ago

The only glue I have tried and found to stick successfully to silicone is called 'Fantastic Elastic Flexible Glue', made by 151 Products Ltd (http://www.151.co.uk/) of Manchester, UK. I have bought it in the UK from my local Pound Shop.

Unfortunately, the company's website is terrible and provides no detailed information about its products. However, I see that the 20-gram tube states "Contains (3-trimethoxysilyl propyl) ethylene-diamine", which suggests that the glue is also silicone-based.

I used this glue to repair a swimming mask whose head strap was about to break, using a section of bicycle inner tube as a flexible patch across the failing section. I found that clamping the patch to the strap while the glue cures makes a big difference to the durability of the repair.

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EllliamE

3 years ago

Hi all, I am no glue expert but i see you all know a lot about this so Im very happy to find this place. I got a little project where I need to find a great glue to glue these two layers:

1- a fabric of textile (cotton or also satin) ( pink in the picture= satin textile fabric)

2- a flexible silicon gel very thin layer ( seethrough in picture) stains are the superglue3.

I have tried everything but nothing works so far. the super glue 23 glues but then it actually comes off eassily from the textile layer. I dont know what to do, can you experts help?many thanks! :)

IMG_20160819_194613.jpg
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labomed

8 years ago

try using E6000 glue. However, I am looking for a glue that is electrically conductive and glues Plastic to silicone

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AleshaB4labomed

Reply 6 months ago

Do not use E6000 it will not adhere to silicone. I have to repair my silicone mermaid tail all the time and I've tried everything. Only thing that works is SilPoxy.

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anon19523092labomed

Answer 2 years ago

DO NOT use E6000! It failed completely on silicone rubber when I tried to glue it to a weightlifting plate. The E6000 stuck to the metal really well, but it peeled off the silicone rubber potholder I was trying to stick it to effortlessly.

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jubilee007labomed

Answer 6 years ago

Hello dear, we have that conductive coating which you need.

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LoriC105

7 months ago

I've been having issues with my tub/shower. The tub is porcelain I think, and the tub surround is plastic. I've used 100% silicone, and it came loose from the plastic, I pulled it all off, dried it and did it again, and used a bigger bead so it smoothed out wider.......Well it came loose again! So I got it dry and used my hot glue gun!!! So it held those plastic water things on the top of the tub to keep water out, and now the surround is loose again

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Fiction

8 years ago

While this is most likely a dead thread, other sources on the web say that you can glue to silicone using 3M yellow weatherstripping and gasket adhesive.

I am posting this to say that it does not work. It peels off effortlessly. Don't waste your time.

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FictionFiction

Answer 8 years ago

As a follow up, Devcon Silicone Adhesive works fantastically. I have the verson with 310 PSI bond strength, and though I was looking for the 700 PSI version, 30 minutes of cure have created a bond stronger than than the 1/4" silicone I was gluing.

I am gluing silicone foam to an insole... probably a nylon-based fabric. No sanding or prep was given to the silicone before gluing, other than it being visually clean.

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BLADDERWORT

1 year ago

Anyone mixed up mold RTV silicone rubber and tried that to join the surfaces together. Silicon only sticks to silicone and nothing else.....

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chrisdc85

2 years ago

I'm not an expert but one approach is silanization. Basically two ended molecules. One sticks to a 'normal' surface. The other has siloxane groups that bind to silicone. Several different molecules do the job. They are often used to prep glass in micro bio labs and for electronics. MPTMS is a uv curable example. I'm planning to test this out as part of building a pneumatic muscle.

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BryanH91

3 years ago

I know this is a dead thread, but just in case anyone comes to this page in search of an answer, here are two Permabond products that can be used together to bond silicone. Permabond Polyolefin Primer and Permabond 2050.

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AhmedQ

3 years ago

I was facing the same issue... was trying to stick shore A 27 silicone rubber to ABS plastic. Turns out Loctite does the job... as mention before in this thread. It is also worth mention that i read that any adhessive with cayanocrylate (which loctite has) will do the job... Hope this helps

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bsteines

3 years ago

Potentially useful information for someone out there. Silly Putty bonds instantly and tenaciously to silicone. Parents with kids may have discovered this on the buttons of their remote controls, lots of patience and scraping to remove.

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ceremona

3 years ago

I you want instant cure, this is the stuff: Loctite 5033. Light (UV LED) cure. Prices vary depending on reseller. https://www.amazon.com/dp/B0080IQTOA/ref=wl_it_dp_o_pC_S_ttl?_encoding=UTF8&colid=YYZ5DK1GJ3AO&coliid=I2HL2DE67O6CFW

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piojo9

4 years ago

I was just very surprised to find that Loctite "Ultra Gel Control" super glue can bond some types of silicone, so it's worth a try. As for this glue's performance on plastic, I'm not sure. You can always increase your chances by degreasing, sanding with 200-600 grit sandpaper, then degreasing again.

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EricH24

4 years ago

I was tired of the silicone ear bud tips slipping off of my plastic Bluetooth ear buds. I roughed up the shiny plastic surfaces with a nail file and cleaned the bonding areas with rubbing alcohol. Then bonded the silicone to the plastic with Freesole urethane formula shoe repair. It works great.

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jubilee007

6 years ago

Our products can be used to stick silicone to plastic, the theory is the same with the first repler, activity its surface first, and than use instant glue can stick them together.

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Satweavers

6 years ago

I just glued a silicone rubber pad back onto a plastic headphone using this product that's available on line: Dow Corning 3145 RTV MIL-A 46146 adhesive/sealant. I cleaned all surfaces up with denatured alcohol, wiped them down. When the stuff cures, it's the most dense, toughest silicone I've seen. Has a really aggressive bond. Durometer 45.6 Shore A. Tensile strength 864 psi. Unprimed adhesion - lap shear to aluminum 1900 psi.

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Talo199

7 years ago

Try this: http://www.smooth-on.com/Epoxy,-Silicone-an/c11_1189/index.html?osCsid=rroncsv8o31mujcl356i421do5

Works great!

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seandogue

10 years ago

Dumb question... Have you tried silicone sealant as an adhesive?

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Grathioseandogue

Answer 10 years ago

Whoops, left that off my list. Yes I tried it but it pulled away from the plastic pretty easily.

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seandogueGrathio

Answer 10 years ago

lol...seemed an obvious choice, but ... I think Steve has made a good observation/suggestion...