I am finally ready to make some 16x20 prints. My first ones will be contact prints of some glass plates that someone is hiring me to print. No, he doesn't have the camera, but I'd love to see that thing, and, yes, I've printed smaller contacts for him and warned him this will take more time and be way more expensive. Anyway, my question is this - how much liquid (developer, stop, etc..) do you usually use at this size? I usually use 1 liter for 8x10 and 2 liters for 11x14. Is 3 liters enough? I'm not really going to be able to slosh the trays much because they're on a rack (thank you, Jim), so they need enough to cover well.