I use the K15 Black to cover bullets use to test new coloured coatings.
Mix it 20gms:100mls. 2 coats covers really well.
These bullets get 4 actual coats and perform perfectly.
The easiest way to clean coating from trays used for coating only is to soak them in a tray of acetone for 5 minutes and them wipe with cloth etc. Or scrap with a razor blade and them wipe with Acetone on a cloth.