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Old 03-04-2010, 09:38 AM   #1
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Default How to prevent decal yellowing ?

Hi Guys: I know decals would yellow but never expect it happens so soon. Does anyone here also have the same situation? I applied the decal last summer but I noticed it had already yellowed last December. I assume the cause comes from high temperature during summer times in Taiwan. Is there any way to prolong the lifespan of decal without yellowing ? It's impossible for me to keep models in air-conditioned environment all the time. I would appreciate your sharing.



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Old 03-04-2010, 11:19 AM   #2
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Default Re: How to prevent decal yellowing ?

I was told to coat the decals with a layer of "top coat" (I think it's by HobbyMaster, or was it ModelMaster?!?!). I don't know if it really works, but so far, my decals have not yellowed yet, and I've applied them since November. Does that stuff really work?
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Old 03-04-2010, 12:02 PM   #3
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Default Re: How to prevent decal yellowing ?

hmm, looks like those have yellowed fast. those are my decals right?
as high flight said, did you clear coat your model afterwards? use a UV clear coat for top shine and UV protection (you can get it in automotive stores and stuff, doesnt need to be in a hobby shop, hobby stuff is actually a but rip off)

some have said that decals printed on synthetic papers will last longer than those that arent (hasegawa decals). hasegawa decals are supposed to yellow even with a clear coat.

my decals have been on my planes since day 1 of my 773ER decals....no yellow at all.

and remember, nothing lasts forever in this world. even clear coat may yellow given time.

btw, arent 773ERs supposed to have their cut here in emergency signs aligned down the center? only 4 of them
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Old 03-04-2010, 03:55 PM   #4
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Default Re: How to prevent decal yellowing ?

Oh no! Not Kai's decals! =(

I better crank out my C-FIVS and clear coat before this happens to me.
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Old 03-04-2010, 06:27 PM   #5
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Default Re: How to prevent decal yellowing ?

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Originally Posted by B-16707 View Post
hmm, looks like those have yellowed fast. those are my decals right?
as high flight said, did you clear coat your model afterwards? use a UV clear coat for top shine and UV protection (you can get it in automotive stores and stuff, doesnt need to be in a hobby shop, hobby stuff is actually a but rip off)

some have said that decals printed on synthetic papers will last longer than those that arent (hasegawa decals). hasegawa decals are supposed to yellow even with a clear coat.

my decals have been on my planes since day 1 of my 773ER decals....no yellow at all.

and remember, nothing lasts forever in this world. even clear coat may yellow given time.

btw, arent 773ERs supposed to have their cut here in emergency signs aligned down the center? only 4 of them
Yes, Kai it's your decal. As I said I know decal would yellow but just want to find way to last it. I don't use any coat and I'll try it. For "cut here" signs Moin also had the same question before. SIA seems to use the same way as Air India B773 to mark this sign. My model's registration number is 9V-SYA and check this photo:

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Old 03-04-2010, 06:34 PM   #6
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Default Re: How to prevent decal yellowing ?

oh yes, clear coat is your answer then. you must clear coat, its necessary for any decal job.

oh i see, those are the non -ER -300s! i see, ok now those have more cut here signs!
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Old 03-04-2010, 06:49 PM   #7
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Default Re: How to prevent decal yellowing ?

Kai if you could make like two pages of just "Cut here" Decals, I would buy those in a second.
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Old 03-04-2010, 07:13 PM   #8
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Default Re: How to prevent decal yellowing ?

So....I'm kinda confused...where do we apply the clear coat? just the decals sheet? or the whole model after applying decals?
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Old 03-04-2010, 07:40 PM   #9
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Default Re: How to prevent decal yellowing ?

I know this sounds silly, but can someone post a pic or link to a clear coat product. I'm going to get decals, then I need to know what is to be used to stop preventing yellowing.
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Old 03-04-2010, 07:43 PM   #10
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Default Re: How to prevent decal yellowing ?

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Originally Posted by 1:200Freak View Post
I know this sounds silly, but can someone post a pic or link to a clear coat product. I'm going to get decals, then I need to know what is to be used to stop preventing yellowing.
I also want to watch how to apply clear coat the right way ...
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Old 03-04-2010, 08:48 PM   #11
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Default Re: How to prevent decal yellowing ?

I just pick up some "future" floor wax and airbrush it on like paint. If you don't have an airbrush then I'm not sure what to do... Maybe just paint it on with a brush?
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Old 03-04-2010, 10:28 PM   #12
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Default Re: How to prevent decal yellowing ?

spray your whole model.

future floor wax


ive switched to all automotive products. now using duplicolor clear (one on the right). much cheaper and dries harder. careful using it with chrome paints as it reacts negatively to it.


and im sure everyone is smart enough to find clear coat in a hobby shop.
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Old 03-04-2010, 11:10 PM   #13
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Default Re: How to prevent decal yellowing ?

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spray your whole model.

future floor wax


ive switched to all automotive products. now using duplicolor clear (one on the right). much cheaper and dries harder. careful using it with chrome paints as it reacts negatively to it.
So I guess the one has to remove engines painted with chrome paints, before spraying. Does future floor wax actually give that gloss to the model? while the other two cans are to clear coat?
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Old 03-05-2010, 12:10 AM   #14
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Default Re: How to prevent decal yellowing ?

future will give a slight sheen. really high closs youll need to find some uv clear coat.
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