they used the actual paint from the stealth fighter....i find that hard to belive. That "paint" stuff is still ultra top secret. Maybe they used something similar from another company???

 

flat black paint, no right angles, and no on board radar emmitting or detecting equipment, another thing to remember is that the stealth bombers aren't invisible to radar, they are simply very hard to detect. The stealth technology only decreases a vehicles "visibility" to radar, it doesn't eliminate it. When the b-52 or 117's go on missions, they fly very specific flight patterns that will weave them between the shrunken radar ranges, if they would accidently fly into one of these ranges, they would be detected. yup.