Who does not know it? You buy a model kit looking forward to building it only to find out that the decals (decals) are yellowed. This is certainly an eyesore, but in the end no problem. With a little time and patience you can get them clean looking again.
To make the decals look like new again, you must do the following:
Place the decal sheet for at least 3 weeks in direct sunlight. The best results are obtained by subjecting the sheet longer than a month in direct sunlight. The easiest way is to put the sheet in a sheet protector with the pictures directed outwards and fixed on a window with tape. The tray on the dashboard of a car can also be used very well. Provided, of course, the car is parked outdoors and gets sunlight.
With a little patience and a very small amount of work you can get back fresh shiny decals.
I hope that this litte tip helps you to prevent anger and to continue modelling.
If you are looking for rare model kits, just want to poke about in our shop or you are planning your next model construction project, I recommend my shop: http://stores.ebay.de/harroshandelsplatz/
Have fun modelling (with fresh decals)!