Yeah, just go over it. I've actually discovered that a lighter first coat all the way around makes it look a lot better, and the colors a bit more vivid (I was painting an M700 stock OD, and a first coat of bright green made it come out awesome.
... or not care about it, and the areas you touch most pick up wear patterns faster (I like them a lot, but you may not). I like doing that, and I"ll even use a really lame under-coat so it's more obious, but usually I just clean the areas that need to stay colored, and let the rest just kinda go however they want.