I just painted the areas that would show up with some of my wife’s acrylic paint and it had surprisingly good coverage. That was all just one coat. I know nothing about paint, so this is probably just the Walmart brand or something, but it was “Delta Creative Ceramcoat” and the color was Ocean Reef Blue.
Also, they are all the same color, but in the future I might try to darken them for each layer. They look darker in the picture b/c of the lighting, but with direct light they kind of blend together.