I try and remove insoles after use, wash off all mud, reseal/waterproof while still slightly wet and slow dry, then put the insoles back in.
In the past on leather boots I used "Mink Oil" and "Sno-Seal" for waterproofing. Both would darken leather, most-times softening the leather, sometimes the leather would stretch, and the water repellency would last a fair amount of time.
Lately I have been using Nikwax "Aqueous Wax" shoe waterproofing.
This is fairly easy to apply (a different kind of mess), it does not seem to change the color much or soften the leather and the water repellency lasts a fair amount of time.
YMMV
In the past on leather boots I used "Mink Oil" and "Sno-Seal" for waterproofing. Both would darken leather, most-times softening the leather, sometimes the leather would stretch, and the water repellency would last a fair amount of time.
Lately I have been using Nikwax "Aqueous Wax" shoe waterproofing.
This is fairly easy to apply (a different kind of mess), it does not seem to change the color much or soften the leather and the water repellency lasts a fair amount of time.
YMMV
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