How much paint of the secondary color would I need for sponge painting per gallon of the primary color?

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I usually have people pick up a quart of the secondary color, but it all depends on how drastic of a look you're going for. Most of the time it's only a subtle tone when you're doing it, so the quart should work well enough. You can always get more if you need it later on then too, and not waste a whole gallon....Show more