Yep, you want a wash. While they're just heavily watered down paint at their absolute simplest, they work much, much better with the addition of mediums to tweak their behavior.
A surfactant (flow improver like Flo-Aid, but even a touch of dish soap works, in a pinch) helps them flow and pool properly, directing the pigment into recesses for more even and directed shading. Acrylic medium (usually matte, but any would work) helps keep the pigment in suspension (avoids clumping, which leaves a chalky, uneven finish) and lets the mix properly bond to the model's surface, while keeping the opacity low. I like to add a bit of drying retarder, as well, for working on larger areas. If the wash dries too quickly, it can develop tide marks - a longer dry time lets me cover the entire surface, working wet into wet, to avoid that. Water, of course, is still a major ingredient, as that's what gives the wash its thin consistency.
Plenty of hobby paint companies have lines of washes formulated with varying ratios of the above ingredients, ready to slap onto your models (some right out of the pot, others work better with a little additional thinning). I've used Citadel, Vallejo, and Army Painter washes, all successfully, and now mix my own, as well, using both acrylic paint and ink. Washes really are great tools for the painter, whether used as some quick "liquid skill" for a novice's tabletop army or subtle glazes and filters for an expert's masterpiece display model.
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