I have Lowa leather hiking boots with a rubber toe cap and sidewalls which I bought around 5 years ago. I've gotten great use out of them and the leather is still in great shape, but the rubber is starting to crumble.
It's basically very brittle and is slowly peeling away from the leather upper. As a work around, I've used an adhesive to coat the rubber and reattach it to the upper, but I'll need to buy new boots soon.
My question is how to postpone the rubber's degradation on my new boots. Since the rest of the boot is in great shape, if the rubber were not cracking, I could get another couple years out of the pair. What care tips can keep the rubber flexible and in good shape?
I've seen suggestions about using glycerine soap or silicon oil for boots with full rubber uppers. Would these products also work for my issues?