I just got a wheelset with Open Sport hoops. I don't much like the wear indicator channels in the rim sides. I expect the wear indicators to be like those on my two-year-old Alex rims -- a dark area that extends a some distance into the rim. I certainly didn't expect to have circular ditches in the brake surface.
Has anyone had luck filling these channels with any softer-than-aluminum substance? I'd like to do that both for aesthetics and for more even brake pad wear.