To create an exposure closet, use a drop cloth or old newspaper to create a resting spot for the screen. Place a small fan inside the closet but don’t turn it on yet. Use old fabric or blankets, dark in color, or black garbage bags and tape to the walls to resist as much light as possible. The lights can be on while setting up but need to be off for the next step.
Make sure the screen is propped up against the wall with the flat surface facing you. Use one hand to hold the screen steady and the other to hold the trough. Using the rounded edge of the trough, squeegee up the back of screen, holding the trough at a 45° angle, and applying even pressure throughout. The entire screen should be covered in emulsion. Then use the sharp edge of the trough, not to apply more emulsion, but to scrape off any excess using the trough the same way.
