If it was me doing this project , I would spray the PPG's DPLF first , for an excellent ground coat , then use the evercoat feather fill . ( blocking smooth )
Then buy a Qt. of PPG's DAS sealer ( if using PPG's DBC Base color ) and shoot this ( comes in white , Lt Grey , & Dk Grey ) , letting it sit 15 min, Then shoot your base and clear .
PPG's DPLF Epoxy doesnt lay very smooth IMO .