Watching thread for tips too. I have a BW and other pins in need of the same. Torn on this issue...I have been told multiple times,by multiple people, to leave these cabs alone. Reason, supposedly, is the value would actually be higher if left in an "original" state. I dunno....I think I am with o.p. and wouLd like to touch up and get a protective layer on them that can "stand tge test of time" and prevent further damage/deterioration.