In fact, Wallbike sells the returned saddles on E-Bay. There is no reason a used saddle cannot reform to another's tush. It's just leather, not concrete - even tho some people swear otherwise. Same cautionary notes apply: Do not "soak" it in oils. Do not attempt to "speed up" the process. Apply very little of the Brooks product, Proofide (or anything even somewhat like it), and just ride it.

Carry the ubiquitous plastic bag under the saddle for cover when off the bike in the rain. You can smear a ton of SnoSeal under the saddle if you want to, without any concerns at all. That'll do a decent job of protecting the underside if you insist on not using fenders. Re-apply whenever you feel like it - SnoSeal cannot soften leather hide, no matter what they say - even in the SnoSeal adds.

Don't apply it to the top as it can become a bit sticky in the heat.