Until recently I worked in the R&D department of the Cosmetics & Toiletries Industry. We routinely used cyanoacrylate glue ('super glue') for taking skin biopsies. You take a piece of clear plastic, smear it with super glue and stick it to an area of a volunteer's body (usually their forearm). After about 30 seconds you remove the piece of plastic from the volunteer's arm taking the top few layers of the stratum corneum (SC) with it. You can then treat the piece of detached SC with various substances (usually surfactants) and dye it with other substances, examine it under a microscope etc. The only slight problem with this approach is that you are dealing with the underside of the SC layers rather than the top - but it can still be a useful method. Surprisingly, this procedure is relatively painless and trauma-free (I've been a volunteer many times).

In my experience super glue isn't of much use for anything else ...