"oops" it at hardware stores, ive used it 3 times

(stupid tape ruining my nice paint) its good stuff, leave your car in it for like 4 hours and the paint just falls off, absolutely no damage to plastic (however will fog your head/tail lites)
btw this is a lil off, but why is it that after i paint my windows black, let dry for a day, and mask with the blue tape... well when i take the tape off, it comes out all screwy, like the tapes glue stays on the tape... please help, i may just spray paint a peice of paper, and just glue the paper to my windows...