Okay, I'll answer the question as to what Press N Seal is used for. You trace your quilting pattern on it. Then you stick the Press N Seal to the quilt and quilt it. Then you just peel the Press N Seal off. Your quilting is done and the fabric is clear of markings. Hope this helps you to understand.
As for the sticky needle... Whatever it is they use to make the Press N Seal stick to things, leaves a little stickiness on the needle after you have used it a while.