The "Blue Tape" is called painters tape. It is made by 3M. It can be found at hardware stores and a lot of retail stores in the paint section. It's good stuff but it shouldn't be left on beyond for extended periods of time.
just don't use the blue 3M tape on a nitro finished body or neck. the tape adhesive will soften the finish and you will be left with a finish that remains sticky no matter how many times you clean it (don't ask me how I learned this difficult lesson)