With the usual warning that on my best day, I'm a rookie, I've had great results with Blackrocks Leather N' Rich as the only finish I've mostly used. Hats, holsters, sheaths, whatever, rain just beads up and rolls off. On no particular schedule, I'll reapply it. It provides a decent sheen. The hat in the profile pic has saddle tan dye, a little antiquing gel and Leather N' Rich. It's been rained on at least a couple dozen times with no ill effects.
Plenty of my stuff got no dye, nothing but Leather N' Rich. It all acts the same.
And, it's a great hand lotion!
Just what works for me.