best thing for ya to do, go to times square after 11 pm and ask one of the guys doing it when they are on their breaks (the spray painters i meant) or ask the vendors too, most of em are willing to share info, those that dont suck, and dont matter, cause there will be plenty of people who will help ya out. good luck. i am pretty sure a tax stamp would be your only required thing, then you have to follow the rules as to when you can and can't be out there, usually after 11 PM sun-thur and after 1 am fri sat, but that is totally a BS time thing, cops can come yell at you even after the 11 PM time, and they also will sometimes leave you alone before 11..there is really no rhyme or reason. good luck.