After cutting in your ceiling and walls, paint the ceiling with the undercoat. Use a roller for good coverage when painting larger surfaces. Make sure you keep the flat surface of the roller on the wall side when rolling, so the metal bracket doesn't damage your wall.
When painting a surface, always start by cutting in the edges. Use a cutting in brush, which is cut on an angle, to make sure you get an even, clean job. Apply your undercoat to all the edges. Make sure you've got adequate ventilation while you paint – open doors and windows, and use your bathroom exhaust fan.
Once you've done the ceiling, start painting your walls with the undercoat. Follow the same process from Step 5 and leave to dry before applying your top coat.
Put some painter's tape down along the edges of any floor or wall tiles to stop any paint getting on them and to keep your paint lines straight when you're cutting in.
Stainless steel and other metal sinks are sprayed with an undercoating, which is latex or a rubberized material. The undercoating is a bit unsightly, as it is often black in color, and is sprayed over the noise-dampening pad that is fitted to the underside of the sink. The undercoating is only sprayed on the underside of the actual sink basin; the coating rarely makes it onto the sink lip or plumbing parts.