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Suggestion for adhesive for silicone tubing

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  • Member since
    March 2015
  • From: Close to Chicago
Suggestion for adhesive for silicone tubing
Posted by JohnnyK on Friday, September 10, 2021 12:50 PM

I am working on a model that has silicone tubing that needs to be glued to plastic nipples. In tried silicone caulking, but that did not work. Any suggestions?

Your comments and questions are always welcome.

  • Member since
    January 2010
Posted by rob44 on Friday, September 10, 2021 1:12 PM

You might want to try the Bondic type UV setting resin. Not sure it will work but worth a shot. I would also sand the tubing if possible to allow the stuff to adhere better.

  • Member since
    March 2003
  • From: Towson MD
Posted by gregbale on Friday, September 10, 2021 1:33 PM

Pretty much the only 'industry' adhesive used for silicone is a product called Sil-Poxy...not all that hard to find, but pretty pricey at something like $20-30 for a 3 oz tube.

Stuff like UV resin might work...it probably depends on how much stress your attachments/joints are under.

Greg

George Lewis:

"Every time you correct me on my grammar I love you a little fewer."
 
  • Member since
    March 2015
  • From: Close to Chicago
Posted by JohnnyK on Friday, September 10, 2021 3:08 PM

The kit is an Italeri, 1/12 scale. Silicone tubing, about 1mm o.d. was used as the ignition wiring. Why Italeri decided to use silicone tubing for the ignition wiring is beyond me. Maybe I should just by some rubber tubing.

Your comments and questions are always welcome.

  • Member since
    March 2003
  • From: Towson MD
Posted by gregbale on Friday, September 10, 2021 3:13 PM

For that application, contact cement might work well enough.

Greg

George Lewis:

"Every time you correct me on my grammar I love you a little fewer."
 
  • Member since
    January 2010
Posted by rob44 on Friday, September 10, 2021 6:33 PM

Soem 1mm black insulation wire would probably be a good replacement.

  • Member since
    September 2012
Posted by GMorrison on Friday, September 10, 2021 6:40 PM

I'll make another suggestion.

I do this on my bike models, most recently the Norton 750 Commando.

Because they are cast in a mold, those nipples always have draft, i.e. they are slightly cone shaped. The elasticity of the tubes will eventually cause them to squeeze themselves off.

Non-solvent glues, (adhesives) can't be relied on to hold things together if there is a force tending to separate them.

Cut the little nipple off and scrape whatever base is left. Find a piece of soft brass wire that is a snug fit in the tubing. Drill a hole centered on where the tubing attaches, the same diameter as the wire. First glue the end of the wire securely into the engine head with CA. Then when it sets clip off leaving a good 1/8" or so. Dab some CA on the wire and stick the tubing down flush.

Still not much adhesion, but you've removed the forces trying to pull the pieces apart.

Hope that helps.

 

Bill

 Modeling is an excuse to buy books.

 

  • Member since
    April 2020
Posted by Eaglecash867 on Friday, September 10, 2021 8:17 PM

If it already has plastic nipples that the tubing pushes onto, I would think that a little drop of thin CA at the opening of the tubing would work.  Just put a drop of it in the end of the tubing and push it onto the nipple with the engine inverted, then put the engine upright.  Gravity and capillary action should do the rest.  It won't be an indestructible bond, but it should be enough to keep your tubing from just popping off on its own.  You don't have much surface area to work with on the mating surfaces, so CA is probably your best bet.  Just keep a couple of tightly twisted chunks of paper towel close by to use as wicks, just in case a little bit of the CA escapes from the bottom of the tubing.  A quick touch with the paper towel wick will draw off excess CA without damaging paint work.  You probably already know this, but a metal tray or something heat resistant should be nearby too, just in case your CA wick catches fire.  Sometimes they do that, depending on how hot your CA is.

"You can have my illegal fireworks when you pry them from my cold, dead fingers...which are...over there somewhere."

  • Member since
    July 2008
  • From: Albany, NY
Posted by jeffpez on Saturday, September 11, 2021 6:06 AM

This looks like the Afla 2300 kit. I built it last May and used a tiny bit of CA on each connection for the tubing. A year plus later everything is still in place.

  • Member since
    March 2015
  • From: Close to Chicago
Posted by JohnnyK on Saturday, September 11, 2021 11:33 AM

Hi Everyone,

Thanks for all of the great suggestions. I appreciate your advice. 

 

Jeffpez,

Yes, this is the Alfa 2300 kit. I'll give the CA a try since it worked for you.

Your comments and questions are always welcome.

dlh
  • Member since
    March 2017
  • From: Chambersburg, PA
Posted by dlh on Monday, September 13, 2021 10:42 AM

JohnnyK

The kit is an Italeri, 1/12 scale. Silicone tubing, about 1mm o.d. was used as the ignition wiring. Why Italeri decided to use silicone tubing for the ignition wiring is beyond me. Maybe I should just by some rubber tubing.

 

Hope to see some pics of that car.  Your work on the Tamiya p34 was stellar.

I built the Italeri Fiat Mefistofele, so I've been eyeing both Alphas.

Dave

  • Member since
    June 2021
Posted by rocketman2000 on Wednesday, September 15, 2021 7:42 AM

You could try wrapping the connection with fine copper wire (say #28 or 30), then paint black to look like boots.  Wrap as tight as you can.

 

Don Stauffer in Minnesota

  • Member since
    March 2015
  • From: Close to Chicago
Posted by JohnnyK on Thursday, September 16, 2021 1:49 PM

Thanks to everyone for you suggestions. Here is what I did. I purchased some 1/12 scale spark plug wire and used the silicone tubing as boots. I used CA to glue the silicone boots to the plugs and distributor.

Your comments and questions are always welcome.

  • Member since
    July 2008
  • From: Albany, NY
Posted by jeffpez on Thursday, September 16, 2021 2:29 PM

Looks terrific. I sure wish I'd thought of that back when I needed it

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