We used Sikkens Rally Black Paint for our two-tone finish. We added a flattening agent to the paint and sprayed test cards until we achieved the desired semigloss. Glazier's Mustang Barn gave us an exact mix that it uses for the black and argent in Sherwin Williams Urethane. For the black mix, use one part 1738 (black) and one part T1F271 (flattening agent). For the argent, use the same mix but replace the black with 33624 (argent).