Alternatively, cheaper, less messy and far better looking (IMO only!)...obtain a small can of matt-black model spray paint...specifically the model stuff, from a model shop ('cos it doesn't chip or scratch). Mask off a strip down the back of your egg (so you can see your paint level) and spray away......
Result : Stealth Black Egg. I've seen someone do this, it took all of 3 minutes and the result was pretty cool......