Hard bond refers to what the salons do to attach for 4 weeks. For me it involved glue on my scalp and on tape which was attached to a poly strip. Did that for years, but since i switched to all lace and re-bond 3-4 days, I like it better. The base is not what wears out first, it's the hair. If it's not shedding, it will lose it's curl and color long before the base wears out. I don't recommend any attachment over 1 week; the longer you wait, the worse the clean-up. If it's a long term bond you want, better to use a poly strip/perimeter. Clean-up is easier; experience is the best teacher.