I bought a badly faded NF a few years ago, it was basically black and white, and back then I couldn't find the decals anywhere. My solution was nowhere near as ambitious as yours. I used a bunch of sharpies to add the colors back with the help of my then 7 year old son. The skull was also yellow, and my son asked my if we'll paint that too. I followed his advice, sprayed it white (taped over the eyes) and added the blacks with sharpies. Came out looking new, cost almost nothing. Fun game, fast and very unforgiving.

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