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So it says quote
"Whenever you are the only creature affected by a bardic performance or raging song that normally affects all allies within a range, any bonuses granted by your bardic performance or raging song are calculated as though your class level were 4 higher. This feat does not allow you to activate a bardic performance or raging song if your actual class level is not high enough to use that performance."
And since furious paint makes it so you're the only one affected by a raging song that is supposed to work on multiple people I'm thinking this is a good way to give it a much needed boost. This is even more supported by the fact that you can still do the regular song.
I'll be honest I'm leaning on the side of "probably not" but it never hurts to double check.
War painter does not normally affect all allies, so I would say that it cannot be boosted
War paint isn't a performance/Raging Song... it's simply another way to use Raging Song... I think it works.