For a solid coverage, use a similar color in Americana Acrylics to basecoat the surface.
Let completely dry before applying additional coats.
When first applied, Holographic Illusions will have a slightly milky look, but will dry completely clear.
For an accented or sparse look, use a contrasting color and apply Holographic Illusions sparingly.
They work best when applied with a fan brush or another thin, flat brush to a textured surface, which helps grab the paint for more glitter coverage.
It's always a good idea to keep a separate set of brushes designated for use with glitter paints.