Author Topic: Vac-form canopies going yellow  (Read 338 times)

0 Members and 1 Guest are viewing this topic.

Offline JayBee

  • Won't go back to Hull again
  • What-IF SIG
  • Needs A Life Outside What-If
  • *****
  • Posts: 4019
  • "Aquilla non captat muskas"
Vac-form canopies going yellow
« on: January 07, 2019, 11:42:35 am »
As the title says, I have some vac-form canopies that have started to go yellow.
Does anybody out there know of a way to reverse this.
They are from the Special Hobby F2G Corsair in 1/72.
Could it be the material that has been used to create them?
I have several sheets of Falcon canopies that are far older which are clear as anything!

I would be most grateful for any helpful suggestions.

Jim
Alle kunst ist umsunst wenn ein engel auf das zundloch brunzt!!

Sic biscuitus disintegratum!

Offline Lord_Voyager

  • Out of the Whiffing Closet
  • **
  • Posts: 27
Re: Vac-form canopies going yellow
« Reply #1 on: January 07, 2019, 12:49:56 pm »
It's the UV in the air from non-incandescent light bulbs... I have the same issue with vacuformed ABS and plastic. There are commercial brand cleaners but I find that the methods here:

http://www.howtocleanstuff.net/how-to-whiten-yellowed-plastic/

this should help you out.

Offline The Wooksta!

  • Resident Soup Dragon
  • What-IF SIG
  • Needs A Life Outside What-If
  • *****
  • Posts: 6324
  • Would you risk it for a chocolate biscuit?
Re: Vac-form canopies going yellow
« Reply #2 on: January 07, 2019, 01:31:28 pm »
It's unfixable.
"It's basically a cure... for not being an axe-wielding homicidal maniac... the potential market's enormous!"

"Now then, Butch Harry. Tell us about Fulham."

The Plan - a Blog
www.whatifmodelers.com/index.php/topic,34762.0.html

Offline JayBee

  • Won't go back to Hull again
  • What-IF SIG
  • Needs A Life Outside What-If
  • *****
  • Posts: 4019
  • "Aquilla non captat muskas"
Re: Vac-form canopies going yellow
« Reply #3 on: January 07, 2019, 01:50:44 pm »
Alle kunst ist umsunst wenn ein engel auf das zundloch brunzt!!

Sic biscuitus disintegratum!

Offline The Wooksta!

  • Resident Soup Dragon
  • What-IF SIG
  • Needs A Life Outside What-If
  • *****
  • Posts: 6324
  • Would you risk it for a chocolate biscuit?
Re: Vac-form canopies going yellow
« Reply #4 on: January 07, 2019, 02:46:58 pm »
Once the chemical reaction starts, that's it.  All you can do is get a replacement.

It's not a UV issue.  I've several MPM/Special Hobby kits where the contents haven't been out of the packet, just stored in a box well out of sunlight and the canopies are now a nice deep gold.  I mean, you could get away with it for the TSR2 (gold in the canopy glass) but not a Ju 388K.
"It's basically a cure... for not being an axe-wielding homicidal maniac... the potential market's enormous!"

"Now then, Butch Harry. Tell us about Fulham."

The Plan - a Blog
www.whatifmodelers.com/index.php/topic,34762.0.html

Offline zenrat

  • Needs A Life Outside What-If
  • *****
  • Posts: 13736
  • What Would Deadpool Do?
Re: Vac-form canopies going yellow
« Reply #5 on: January 08, 2019, 03:22:02 am »
Do they get brittle as well?
Fred

Another ill conceived, poorly thought out, crudely executed and badly painted piece of what-if modelling muppetry from zenrat industries.

"...the dreamers of the day are dangerous men, for they may act their dreams with open eyes, to make it possible.

Offline NARSES2

  • Nick was always on his mind - just ask the Pet Shop Boys
  • Global Moderator
  • Needs A Life Outside What-If
  • *****
  • Posts: 35514
Re: Vac-form canopies going yellow
« Reply #6 on: January 08, 2019, 06:10:19 am »
Strange enough I was looking at a CMR kit this morning and the canopies had started to turn, whilst a couple of far older ones were as clear as the day they were formed. I've never found rhyme or reason for the process ?  :-\ and yes I've not found a way to fix it.
Decals my @r$e!

Offline zenrat

  • Needs A Life Outside What-If
  • *****
  • Posts: 13736
  • What Would Deadpool Do?
Re: Vac-form canopies going yellow
« Reply #7 on: January 09, 2019, 03:07:04 am »
I've seen it on old toy packaging which I presume uses the same material, albeit thinner, for the "window".
Fred

Another ill conceived, poorly thought out, crudely executed and badly painted piece of what-if modelling muppetry from zenrat industries.

"...the dreamers of the day are dangerous men, for they may act their dreams with open eyes, to make it possible.

Offline The Wooksta!

  • Resident Soup Dragon
  • What-IF SIG
  • Needs A Life Outside What-If
  • *****
  • Posts: 6324
  • Would you risk it for a chocolate biscuit?
Re: Vac-form canopies going yellow
« Reply #8 on: January 09, 2019, 03:40:58 am »
I've seen it happen with Lego too.  Late 70s onwards.  White, yellow and blue are always the worst affected.
"It's basically a cure... for not being an axe-wielding homicidal maniac... the potential market's enormous!"

"Now then, Butch Harry. Tell us about Fulham."

The Plan - a Blog
www.whatifmodelers.com/index.php/topic,34762.0.html

Offline joncarrfarrelly

  • Bertie Bassett
  • What-IF SIG
  • Needs A Life Outside What-If
  • *****
  • Posts: 6843
  • Turn that Gila-copter down!
Re: Vac-form canopies going yellow
« Reply #9 on: January 12, 2019, 01:52:16 pm »
Strange enough I was looking at a CMR kit this morning and the canopies had started to turn, whilst a couple of far older ones were as clear as the day they were formed. I've never found rhyme or reason for the process ?  :-\ and yes I've not found a way to fix it.

Different types of plastic used for the particular canopies, nothing to do with the age of the kit.
"Evil our grandsires were, our fathers worse;
And we, till now unmatched in ill,
Must leave successors more corrupted still."
Horace, 65BC - 8BC. Marsh translation.

Offline NARSES2

  • Nick was always on his mind - just ask the Pet Shop Boys
  • Global Moderator
  • Needs A Life Outside What-If
  • *****
  • Posts: 35514
Re: Vac-form canopies going yellow
« Reply #10 on: January 13, 2019, 04:20:37 am »
Logical Jon  :thumbsup:

Rather naively I just assumed that they'd have used the same type of plastic, but then to me plastic is plastic. Now try getting me on the subject of different types of "steel"  :thumbsup: ;D
Decals my @r$e!

Offline PR19_Kit

  • Closeted Take That fan
  • What-IF SIG
  • Needs A Life Outside What-If
  • *****
  • Posts: 28252
  • Whiffing since the 70s
Re: Vac-form canopies going yellow
« Reply #11 on: January 13, 2019, 08:36:21 am »

Now try getting me on the subject of different types of "steel"  :thumbsup: ;D


It's all metal 'innit?  ;D
Any aircraft can be improved by fitting longer wings, and/or a longer fuselage

...and I'm not a closeted 'Take That' fan, I'm a REAL fan! :)

Regards
Kit