The gloss clear we're using is DCU2021. The semi-gloss and flat clears are from their "Global" line and are D8117 and D8115, respectively, sold by the liter. The flattened clears take D8239 hardener and DT reducer. They cost almost twice as much as the gloss clear and I'm not sure why he doesn't just add flattening agent to the gloss clear. But he's the expert, not me.