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White Scars
I love the idea of a White Scars style force, fast moving hit and run tactics. With the new codex I can use existing models in the army without having to have them all painted up as WS (I have Space Wolves but only because that is what teenage me had). I think some outriders will be the next unit I get, but told myself I have to finish the combat patrol I got in Sept before I buy any more models!
A light colour base coat will show up any splodges easier too. For my White Scars I have to pin wash just in the recesses and tidy up any over spill. I'd try thinning your wash a little bit and remember before it dries you can move it around or even remove it with a dry paint brush.
For marines in particular as zooey mentioned the flat surfaces mean an all over isn't usually the best idea but what you can do instead it just put a drop in each recess or run your brush along the underside of the armour and it'll flow to there but not move further.