I been using tapes for a long time, You would think i would be an expert at it by now. But i always have trouble attaching the front of my unit with tape, when i place tape on the lace first. I always get ripples or something. Probably because i never use the alcohol slide lol. blue tape will get messy depending on ur body chemistry. For me, it is fine for 3-4 days, but i detach after that and clean my head anyway, so its fine for me. Blue tape is the strongest, and to me, it also has the best appearance at the front hairline. The reason why I believe so is because it is thinner than the other tapes, more like a glue. THe only problem with the blue for the front is the little shine it has, but the shine on that tape can easily be knocked down to nothing simply by either rubbing a tape backing on the tape, or using ur finger etc. Once the shine is knocked down it looks better than the other tapes.