Yes, Eternabond tape is very hard to apply straight and wrinkle-free. It looks like kind of like the kid that has adhesive tape on the bridge of his glasses...however, the micro-sealant on the tape does seal up inside those folds, so no water can get in. It's important to note that EternaClean solvent should be used to clean and de-grease prior to applying the tape. If the tape is installed correctly and with good adhesion, no water will get behind it anywhere, ever.
I did the seams on my TT when it was new and never had to worry about any leaks or annual re-sealing.
