Mine tends to kind of dull out after a while, and just repeatedly doing my whole head hasn't really made it that much darker. It potentially could, so if you absolutely don't want to be any darker, you might want to do a gloss. But if you don't mind a bit deeper shade, I'd say just do your whole head.
As for thinning, I always let it thaw on the counter, and then right before I use it, I very slowly add some warm water to it. Thins it out a little, and warms it up just a touch. Just be sure to add it slowly so you don't make it too liquidy.
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