I'm looking for a way to treat cracked leather.
The leather uppers of my Scarpa hiking boots are starting to develop cracks at the sides, where the toes hinge. This is despite regular treatment with Nikwax-type products.
Googling returns leather repair products, such as this: Most products seem to be aimed at upholstery repairs and user feedback is mainly about cosmetic aspects rather than durability.
The boots have completed around 1400 miles over rough terrain in nearly
3 years and the soles are fairly worn. I think they're usable for a while longer, so I'm looking to eke out a few more miles, but expensive repairs would be uneconomic.Any thoughts/experiences/recommendations for a repair e.g. filler or coating product, whether specifically designed for leather or other? Car body filler probably wouldn't flex enough :-)