I have about 80 small parts I am doing, engine compartment parts, convertible top frame, ect. I did 2 coats epoxy but was not happy with how they came out (craters). So I sanded the craters out and sprayed 1 more coat of epoxy since I burned thru some edges. I wanted then to spray some 2K so I had some material to sand without burning thru the edges. Then single stage to finish.