Flitz works ok, but leaves a black mess on equipment and tools. For acrylics, it is difficult to get better than Novis 2 followed by Macguires Plastx.
IMHO, Flitz IS the best product for shining aluminum, kitchen (stainless) steel or brass prior to adding a CA finish. Just be prepared, it's messier than eating a soup sandwich. Buffing a product that has be "Flitzed" requires changing buffing pads.