I have used it many times. Apply it when you want your boots to be water resistant-proof. Be sure to wipe off any excess and then after a few days hit with polish if you want some shine, otherwise burnish with a brush
JR soles are high end, so see if they do a cheaper alternative. Consider also looking for other cobblers to see what price they charge. The last pair of leather soled boots I had resoled was around $80 which included new heels.
Once resoled think about getting a Topy thin rubber sole applied over the leather. These usually run around $40 and are hard wearing and cheaper to replace than a full leather resole.
Not a common problem methinks. Maybe contact Wolverine to see what they have say about the situation.Wolverine 1Ks can indeed by resoled with a commando sole. Have a look back through this thread and you will find examples.
Filson do not offer rewaxing of their twill luggage. I only rewax the informal bags, the formal briefcase get sprayed with Scotchguard.My 232 has been rewaxed a couple of times now and there is some sheen where the bag repeatedly rubs against itself and other things, which I can see some people not liking. On the other hand rewaxing does help darken the faded material and does help with water repellency.