That's part of the beauty of an auto coater. It takes about two minutes to train someone, anyone, how to use it. Mine does have troughs on front and back. Slap two screens in the machine and set them against the stop blocks, lock them in and press start. Keep the troughs full (not too full) and adjust the start delay as needed. A chart on the machine tells you exactly what mesh gets what coating. A huge majority of my screens are coated the same. It's so easy Sam could do it.