What glue can I use to stick silicone to plastic?

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.)

sort by: active | newest | oldest
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.

Any product names for us?

"Silpoxy" is one


bsteines3 months 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.

ceremona4 months 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

RobertR1106 months ago
piojo99 months 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.

EricH2410 months 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.

jubilee0073 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.
What are your products?
labomed5 years ago
try using E6000 glue. However, I am looking for a glue that is electrically conductive and glues Plastic to silicone
Hello dear, we have that conductive coating which you need.
Satweavers3 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.
Talo1994 years ago
Try this: http://www.smooth-on.com/Epoxy,-Silicone-an/c11_1189/index.html?osCsid=rroncsv8o31mujcl356i421do5

Works great!
Fiction5 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.
Fiction Fiction5 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.
seandogue6 years ago
Dumb question... Have you tried silicone sealant as an adhesive?
Grathio (author)  seandogue6 years ago
Whoops, left that off my list. Yes I tried it but it pulled away from the plastic pretty easily.
lol...seemed an obvious choice, but ... I think Steve has made a good observation/suggestion...