bespoken4me, I appreciate your first-hand experience.
I have had no such ill-effects using Lexol or Kiwi on my shell shoes. I've even SnoSealed my shell boots, the heresy!
Shell is still vegetable tanned leather, after-all, and can basically be treated in the same fashion.
Nick V. made a post once to avoid Lexol, but made no follow-up comments of substantiation, that I know of.
It's part of the Mac method...
I have no disagreement with sparing use of kiwi, or Lexol for that matter. My warning is against polishes, creams, or conditioners that contain petroleum distillates, such as turpentine. Alden is, by far the largest purchaser of shell, and they adocate the treatment that Horween does. An occasional wax is fine, but shell is not simply a vegetable tanned leather, like calf. As a muscle, it is treated and fed oils much like bridle leather, ( so many other postings on this) and has inherent foaling wax that calf doesn't contain, so in that respect they are very different.. I would never treat shell the same as calf, but some areas of cleaning overlap, and as such aren't mutually exclusive. Lexol vs Saphir- sounds perfectly fine for cleaning, conditioning. The gist of the matter, is that shell should be minimally maintained. Water, deer bone ( which I don't use), and lots of horse hair, or rough brushing is the most important way to bring out weekly luster. Yes, it can dry if mistreated, but like calf- you never want to artificially enhance the look with over waxing- that will, over time assuredly kill it. So, no real disagreement. Thanks for the posting