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restore the plastic in old kits

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  • Member since
    November, 2014
restore the plastic in old kits
Posted by Old Silver Grizz on Thursday, April 05, 2018 6:57 PM

Having worked with a large plastic injection molding company over the years, I found out that the plastic will dry out and become very brittle.

An easy fix is to place the sprues in a plastic ziplock bag with about 2 tablespoons of water and seal. Let them sit for 3-4 days and they will rehydrate and not be brittle.

This really helps when you score a long out of production kit on your wish list.

I'm building some kits 20+ years old without any issues.

 

Happy building!

 

Old Silver Grizz

  • Member since
    April, 2005
Posted by ddp59 on Friday, April 06, 2018 9:09 AM

i have a problem with that in that styrene plastic used in models is oil based not water & oil & water do not mix well.

  • Member since
    March, 2003
  • From: Northern New Jersey
Posted by Tojo72 on Friday, April 06, 2018 9:13 AM
Welcome aboard,I hate old kits anyway.But thanks for the tip.

  • Member since
    May, 2017
  • From: ohio I want to leave
Posted by armor 2.0 on Friday, April 06, 2018 9:19 AM

If I have to wait 3or 4 days for the plastic to hydration which I don' think going to work .I just put the kit in the trash. Welcome to the forum.

  • Member since
    November, 2003
  • From: Newington CT
Posted by tempestjohnny on Friday, April 06, 2018 10:41 AM
Welcome

 

  • Member since
    November, 2008
  • From: Far Northern CA
Posted by mrmike on Friday, April 06, 2018 12:52 PM

Welcome and thanks for the tip. While "hydrating" plastic may be counter intuitive, I know it works in another context. The manufacturer of the plastic line I use in my line trimmer recommends storing it in water to retain or enhance it's flexibility. It works - the line is much easier to use and lasts longer.

Your suggestion is easy to test, and will come in handy on some old kits in the stash; AMT's Havoc and Viking, and the Classic Airframes SM79.

Mike

  • Member since
    January, 2013
Posted by BlackSheepTwoOneFour on Friday, April 06, 2018 1:19 PM

Old Silver Grizz

Having worked with a large plastic injection molding company over the years, I found out that the plastic will dry out and become very brittle.

An easy fix is to place the sprues in a plastic ziplock bag with about 2 tablespoons of water and seal. Let them sit for 3-4 days and they will rehydrate and not be brittle.

This really helps when you score a long out of production kit on your wish list.

I'm building some kits 20+ years old without any issues.

 

Happy building!

 

Old Silver Grizz

 

 

This would better to post in General Discussion thread, not in the Introduction forum.

  • Member since
    September, 2006
  • From: Bethlehem PA
Posted by the Baron on Friday, April 06, 2018 1:54 PM

BlackSheepTwoOneFour
 

This would better to post in General Discussion thread, not in the Introduction forum.

Second that.  When I saw the post in the forum index, I thought, "What, again?  A new guy joins and posts a technical question in his welcome post?"

The bigger the government, the smaller the citizen.

 

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  • Member since
    July, 2004
  • From: Sunny So. Cal... The OC
Posted by stikpusher on Friday, April 06, 2018 5:37 PM

Isn't styrene impermeable to both water vapor or liquid... Hmm

 

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  • Member since
    March, 2003
  • From: Towson MD
Posted by gregbale on Friday, April 06, 2018 6:33 PM

stikpusher

Isn't styrene impermeable to both water vapor or liquid... Hmm

To liquid, largely yes. But polystyrene is permeable to both oxygen and water vapor.

As a 'lowball' example, stretched sprue can sag with changes in humidity...just as nylon fishing line can.

Greg

 George Lewis:

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

 

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