I use PPG's D893 Global Clear over PPG's DBC & DBU , its rubs like butter even after its been cooked 140 for 40 minutes and sit for 4 days .
PPG stands behind it so I have been using it over their base for 7 years and seen no come backs .
I never liked PPG's 2002 or 2042 as if you didnt hit the buff window just right it was like buffing marble !