We go over 2 very awesome products from Microscale Industries that allow you to apply decals/transfers really easily.
You can add a gloss coat to the area before applying the decals however I find on flat areas it isn't too necessary.
Hope this helps, if you want more info or would like to grab yourself these products they are available at microscale.com I bought mine on eBay but they are available in a lot of online stores and I would highly recommended them.
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