I'm new to leather saddles and I'm working on breaking mine in. I'm using a Brooks B17 Narrow. I use clip on fenders with my bike when the weather is bad. However, sometimes I get caught in the rain, or hit puddles on otherwise dry days. I know that I need to apply proofide to the top of the saddle to protect and condition it, but I'm not sure what to do about the underside.
What strategies are recommended for protecting the underside of your leather saddle?
Would applying proofide to the bottom be appropriate to help protect it? Other suggestions?