Need adhesive to bond plastic to rubber/silicone surface

[Hollywood D]

Here’s my project. I have a Kyocera smartphone that I use as an offline gps on my motorcycle. I have a quad lock mount for it. Here’s a link to the product.

https://www.quadlockcase.com/collections/shop-moto/products/motorcycle-scooter-mount-universal-fit

I need to bond the mount to the back of the phone for a permanent application. The phone has a rubberized/silicone back to it. It has to be strong enough to be able to twist the phone on and off the mount repeatedly and has to be able to stand up to heat/sun and the vibrations from riding a motorcycle on the pavement and off road. The mounting piece that attaches to the phone is plastic.

I’ll never need to remove the mounting piece that attaches to the phone so a permanent application is preferable.

 

[66Caprice]

Try calling your local plastics manufacturer or dealer. They might be able to point you in the right direction!!

 

[AffableCurmudgeon]

Any good two part resin epoxy would do it.

 

[Hollywood D]

After some research looks like 3m 5200 might do the trick. Anyone have experience with it?

 

[Firebrick43]

I doubt if it's truely silicone that anything would stick long term. If it's not silcone and just rubber then many contact adhesives, epoxy, polyurathane or 5200 would work. 5200 is a polyurathane but somewhat rubber like when cured and seals better. Many mahogany boats have a new bottom layer bedded in it when they are rehabbed

 

[Dumber than lumber]

After some research looks like 3m 5200 might do the trick. Anyone have experience with it?

3M 5200 is EXACTLY what you should try. It is my favorite for hard to bond stuff.
If that doesn’t work try 3M VHB.

 

[shelteredV]

this^^^^

 

[Dumber than lumber]

I doubt if it's truely silicone that anything would stick long term. If it's not silcone and just rubber then many contact adhesives, epoxy, polyurathane or 5200 would work. 5200 is a polyurathane but somewhat rubber like when cured and seals better. Many mahogany boats have a new bottom layer bedded in it when they are rehabbed

I think that 5200 is described as a urethane. Not sure how that differs from a polyurethane. (I mean, I know what "poly" means, but ....)

 

[Firebrick43]

I think that 5200 is described as a urethane. Not sure how that differs from a polyurethane. (I mean, I know what "poly" means, but ....)

Nope.
Straight from 3m

"3M™ Marine Adhesive Sealant 5200 is a one-component, high-strength, moisture-curing, gap-filling polyurethane for permanent bonding of wood, gelcoat and fiberglass. It cures to form a firm, rubbery, waterproof seal on joints and boat hardware, above and below the waterline. This product has been trusted throughout the marine industry for over 50 years."

https://www.3m.com/3M/en_US/company-us/all-3m-products/~/3M-Marine-Adhesive-Sealant-5200/?N=5002385+3293241623&rt=rud

 

[toplessHO]

if you dont have to do inductive charging then magnets work for attaching.
Ive used gorilla glue to attach them with good results. Buy some of those coin super magnets and have fun.

 

[rlitman]

if you dont have to do inductive charging then magnets work for attaching.
Ive used gorilla glue to attach them with good results. Buy some of those coin super magnets and have fun.

Gorilla glue sticks to a lot of things. I don't think I'd trust it on silicone, but I've used it to attach the steel discs for a magnet mount on my phone with much success.

However, don't use regular Gorilla glue. That stuff foams up. You want Clear Gorilla glue. That is a non-foaming urethane glue. It sticks to more things than any other glue I know of, and is seriously tough stuff.

Be careful to NOT use the Gorilla brand super glue. That is cyanoacrylate based, and will fail on a phone.

Magnet mounts are pretty strong, but I don't think I'd trust one on a motorcycle.

 

[theoldwizard1]

5200 is FOREVER ! There is no solvent. If you have to get it off, it will require a chisel.

Regular 5200 takes a LONG TIME "set" (24-48 hours) and EVEN LONGER TIME to fully cure (5-7 days depending on temp and humidity). They do make a "fast cure" version (5200FC).

Not quite a strong but a bit less permanent is 4200/4200FC.

My new favorite adhesive is Goop. Extremely sticky ! Not expensive. Probably not as strong as 4200 or 5200 but a lot less expensive.

They key to all adhesives is clean surfaces and with plastics, a light sanding to give the surface some "tooth" to grab on to.

 

[PugetDude]

After some research looks like 3m 5200 might do the trick. Anyone have experience with it?

Best stuff ever. It will bond where everything else fails.

I used some about 4 years ago to fasten synthetic decking boards to pressure treated sleepers over concrete. (too thin to screw or nail) It's held up great. Nothing has worked loose.

Got some on the soles of my work boots installing the decking, it's still there 4 years later...

 

[toplessHO]

I glued down some ceramic tiles that came loose during a real cold spell with reg gorilla glue.
while gluing I left the dispensing tube out over night and some got on the bare concrete
I got the putty knife out to scrape it off and it took a chunk of concrete with it.
5 gal bucket of sand on each tile while it set over night and they are still down 10 yrs later

 

[Dumber than lumber]

5200 is FOREVER ! There is no solvent.
************************************
I think acetone would get it off. Might have to soak it (like put a piece of plastic wrap over an acetone soaked rag).
As far as the Goop brand - they have numerous formulations. Most have lots of toluene and other VOCs. Then they have one called E6000.
Which varieties of Goop do you like the best?

 

[lakelandcat]

Industrial strength Velcro, works great

 

[4 Ever-Fish N]

I have used 3M 5200 many times on my boat for various things. I have also used it on several other things, including automotive. I prefer the "Fast Drying" version. 3M 4200 is less permanent but may also work for you. Put it in the refrigerator after you open it and you should be able to use it again. Otherwise, it will solidify at the opening of the tube fairly soon.