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Old 01-13-2020, 11:19 PM   #1
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Default Basic question about die cast

I have a lot of plastic models and a handful of diecast. One of the plastic models looks yellowish which I assume is UV fading from the sun. While I understand this can be an issue with white models, do the same concerns exist with white diecast models?

I have a handful of Gemini and Herpa 400 models with some white on them and I generally keep them out of direct sunlight. But in one of my rooms, I have skylights and the models could see an hour of direct sun a day. Can that cause the yellowish ting on diecast painted white as well?
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Old 01-14-2020, 03:01 AM   #2
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Default Re: Basic question about die cast

Not sure of yellowing, but I've heard that over time they can fade.
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Old 01-14-2020, 06:49 AM   #3
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Default Re: Basic question about die cast

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Originally Posted by Mirrodie View Post
I have a lot of plastic models and a handful of diecast. One of the plastic models looks yellowish which I assume is UV fading from the sun. While I understand this can be an issue with white models, do the same concerns exist with white diecast models?

I have a handful of Gemini and Herpa 400 models with some white on them and I generally keep them out of direct sunlight. But in one of my rooms, I have skylights and the models could see an hour of direct sun a day. Can that cause the yellowish ting on diecast painted white as well?
The reason plastic models turn cream/yellow is because plastic is an oil-based product which is naturally brown. This also occurs with enamel paints which are oil based. If you paint a model, it is important to use Acrylic paints which to do not discolour. Likewise diecast models are painted with Acrylic paints so should not discolour. However I recommend keeping ALL models out of direct sunlight as in time any printing can fade with prolonged exposure.
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The missing B.707s still needed to be done in 1/400: Ethiopian, Uganda Airlines, Air Zimbabwe (rainbow scheme), Kenya Airways, Air Niugini.

DC-8s still needed to be done in 1/400: UAT, Iberia ('80s scheme), Air Ceylon, Surinam Airways, Air Spain

Aeroclassics Comets still missing- Dan Air (4 & 4C), United Arab Airlines/Misrair/Egyptair, Kuwait AW, Sudan AW, East African AW, Saudi Royal Flt.
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Old 01-14-2020, 07:54 AM   #4
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Quote:
Originally Posted by Mirrodie View Post
I have a lot of plastic models and a handful of diecast. One of the plastic models looks yellowish which I assume is UV fading from the sun. While I understand this can be an issue with white models, do the same concerns exist with white diecast models?

I have a handful of Gemini and Herpa 400 models with some white on them and I generally keep them out of direct sunlight. But in one of my rooms, I have skylights and the models could see an hour of direct sun a day. Can that cause the yellowish ting on diecast painted white as well?
The reason plastic models turn cream/yellow is because plastic is an oil-based product which is naturally brown. This also occurs with enamel paints which are oil based. If you paint a model, it is important to use Acrylic paints which to do not discolour. Likewise diecast models are painted with Acrylic paints so should not discolour. However I recommend keeping ALL models out of direct sunlight as in time any printing can fade with prolonged exposure.
Excellent explanation. I did not know about plastic being naturally brown. Thanks for the info.
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Old 01-14-2020, 08:07 AM   #5
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Default Re: Basic question about die cast

I had a Gemini AN124 change color on me; the white turned off-white/yellowish in a few years with almost no light exposure, but all my others look the same including other white Geminis. Bad batch of paint on that model I guess.
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Old 01-14-2020, 10:43 AM   #6
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Default Re: Basic question about die cast

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Excellent explanation. I did not know about plastic being naturally brown. Thanks for the info.
Plastics are derived from natural, organic materials such as cellulose, coal, natural gas, salt and, of course, crude oil. Crude oil is a complex mixture of thousands of compounds and needs to be processed before it can be used.It is then mixed with whatever colour the end user requires. Most coloured plastic retains that colour, but 'white' will slowly turn cream or yellow in time. Hence why I never buy those cheap plastic airliner models on stands made of plastic, as I know the white will turn cream in time. I used to build airliner model kits using Humbrol enamel paints, but never knew why the white became discoloured until I started using Tamiya Acrylic paints which stay vibrant throughout.
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The missing B.707s still needed to be done in 1/400: Ethiopian, Uganda Airlines, Air Zimbabwe (rainbow scheme), Kenya Airways, Air Niugini.

DC-8s still needed to be done in 1/400: UAT, Iberia ('80s scheme), Air Ceylon, Surinam Airways, Air Spain

Aeroclassics Comets still missing- Dan Air (4 & 4C), United Arab Airlines/Misrair/Egyptair, Kuwait AW, Sudan AW, East African AW, Saudi Royal Flt.
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Old 01-16-2020, 10:05 PM   #7
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Default Re: Basic question about die cast

wow, I learned a lot! Thank you!
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