Same experience here: vast patches of rust after first rain, translating, in my book, to useless junk. I do not stop riding because of rain and rains are an everyday occurrence in our area. There was no follow-up use of R&R. To quote from the label: "The King of Lubes" *Extreme* Rain, slop & dust. This stuff is a must. When the going gets tough, etc. Well, just junk.
and yet boeshield t-9 is supposed to be great I the rain and it does last a little longer I the rain but not much. You Just cant get a clean lube that works I the rain. so you either apply it after each rain or use a wet lube that makes a messy drive train. rock and roll is easy to reapply and even in the rain does not make much of a mess. life is full of compromises.