Can I add Mica Powder to House or Artists Paint?

House paints typically contain titanium dioxide as one of it's major components. This is what gives it coverage, opacity and UV stability.  However it does dramatically reduce the pearlescent appearance and reflection. For this reason we do not suggest you mix it with paint for a pearl effect. The best approach is to put your layer of paint on first and then follow it with a metallic glaze (add pigments to a clear base).