hey! this is my first time on this website and im relatively new to making my own screens so be easy on me. anyways i have some 20x20 screens (the metal border included) and i was wondering what size scoop coater i should get? to my understanding i should go for a 18 or 16 inch but im not to sure!! if someone could let me know their opinion asap that would be epic because im trying to order this on amazon asap, thank you!!