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Advice on "welding" two pieces of plastic together...

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  • Member since
    April, 2017
Advice on "welding" two pieces of plastic together...
Posted by a428Street on Thursday, April 20, 2017 12:18 PM

All, this is my first post.  

I have been out of modeling for about 30 years and recently had a inspiration to get back into it.  I have been reading up on the new techniques, paints, air brushing, etc.  I purchased a membership as well to FSM and both both Donn Yosts DVDs, subscribed to Dr. Cranky, etc.  I'm sure there are other resources I have not found yet as well.

I have been buying used/unfinished models to get my hands dirty.  This is not out of trying to save money but I want to start with practice bodies for painting, etc.  Stuff I don't care about.

One model I bought has a break in the plastic along the vertical support post for the windshield.  It's a Porsche 959 1:16 scale.  The break does not mate up perfectly so gluing and sticking together doess not seem to work (I tried it already).

Is there a technique to fix these types of breaks.  I feel I need to have a process that I can use to keep the parts in line and not have the glue stick to the device I am trying to use to hold them together.  I've thought about epoxy and sand down to match countour, I bought some putty but can't use it until I "weld" the two pieces back together.

Hopefully I was clear.  I could also attach a photo but it's pretty straight forward (the broken plastic windshield support)...

Thanks in advance.

  • Member since
    July, 2012
  • From: Douglas AZ
Posted by littletimmy on Saturday, April 29, 2017 9:11 PM

Sorry I took so long to get back to you.

You have several options

If your window pillar is thick enough (and you line it up PERFECTLY ) you should be able to drill a hole into each end of the break. I belive a #80 drill bit should work. Once you have the hole drilled insert a small bit of wire into one side then press fit the two pieces GENTLY into their position. Use a liquid cement to "weld " the to pieces together.


A kind of iffy fix would be to cut a small piece of clear sheet styrene( the thinner the better ) and glue it to one side first leaving a little overhang Once that dries you can glue the other end of the piller to itself without having to hold it right at the glue joint. (Work from the inside not the outside.)

There will probably be some sanding and if your like me ... some glue to remove from your fingers.

You can also line up the parts and cut a groove accross the break. Then insert a piece of plastic in the groove like a splint and glue one end at a time.

If all else fails you can cut the entire pillar off the car and line it up on the workbench. then glue it back onto the car.

This last bit of advice is sugested as a "last resort" 






I find that screaming helps.......  sometimes. 






 Dont worry about the thumbprint, paint it Rust , and call it "Battle Damage".




  • Member since
    March, 2003
  • From: Towson MD
Posted by gregbale on Saturday, April 29, 2017 9:29 PM

I'd second the recommendation of using wire or a pin---if possible---to give the repair some extra strength. But rather than gluing and puttying, I'd suggest trying one of the "5-second fix" -type products, one of my new favorite tools for such problem areas. When cured (instantly) the resin is virtually the exact hardness of styrene, very easy to shape and sand smooth without any 'feathered' edge showing. (Also seems to take paint well.) Give it a try.

Good luck.


 George Lewis:

"Every time you correct me on my grammar I love you a little fewer."



  • Member since
    April, 2017
Posted by a428Street on Saturday, April 29, 2017 10:09 PM

Thank you for all the replies.


  • Member since
    November, 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Sunday, April 30, 2017 11:24 AM

The thick (gel) CA will fill some gap- as much as a sixteenth of an inch or so, and still give pretty strong joints.

Don Stauffer in Minnesota


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