If you want smooth flowing paint with vibrant color, you can consider using acrylic paint. Acrylic paint is known for its versatility, intense color pigmentation, and the ability to create smooth, flowing brushstrokes. It comes in a wide range of colors and can be thinned with water or mixed with various acrylic mediums to achieve different effects. Another option could be gouache paint, which is similar to watercolor but has more opaque coverage, resulting in vibrant and opaque colors. Ultimately, the choice of paint depends on your personal preference and the specific painting technique.