Estes Mini Max #2445 Build, Part 10, Streamer

The supplied streamer looks to be cut from table top covering plastic. This plastic sheet is textured.
Usually one side has a rougher texture than the other. Run your fingers down the streamer to feel which side is smoother.
TIP: The smooth side will adhere better to the tape set over the shock cord.

The instructions say to use masking tape to attach the streamer. Past experience has showed that masking tape easily tears at ejection.

I use clear packing tape. Be sure the smoother side of the streamer is facing the sticky side of the tape.  It is cut a little wider than masking tape would be. Packing tape is stiffer than masking tape but will certainly hold better.