Carefully pour latex primer into the paint tray. Use a 2-inch paint brush to apply the latex primer around the perimeter of the walls. Roll a paint roller through the primer and apply to the interior of the walls. Paint in long, even strokes working from the top of the wall to the bottom. Allow the primer to dry completely and touch up if necessary.
Clean your paintbrush and roller. Using a clean paint tray, pour the gray paint into the paint tray. Paint the walls with a clean brush and roller. Apply the gray paint using the same technique you used with the primer.
Fill one of the buckets with room-temperature water. In the other bucket, mix together 2 parts of light gray paint to 1 part of clear glazing liquid.
Dip the sea sponge into the water and wring it out. Use your paint brush to gently dab the paint and glaze mixture on to the sea sponge.
Dab the paint-glaze mixture on to the dry, gray walls. Work in a circular motion, dabbing gently to apply the lighter shade to the wall. Work in small sections of the wall, starting in the corner farthest from the door.
Cover all the walls with the light gray paint. Allow the walls to dry completely before applying a second coat if necessary. Keep applying coats with the sea sponge until you reach the desired texture.