Buckets are used primarily when the emulsion coated screen version used in photolithographic processes. Coating, and up against the plate, the plate is pressed against the bucket containing the emulsion from the bottom strongly parallel 3-4 times to coat evenly. Select the bucket to the size of the screen. Use a small bucket to coat about 3 cm left and right. Where no emulsion is coated on the flat can not be wiped clean with a sponge. The coating operation is doing in the light, dry, as do in the darkroom.