How to Paint Hardiplank Siding

Turn on your garden hose and rinse the Hardiplank siding to remove loose dirt and debris. Mix trisodium phosphate and water according to the package directions. Dip a scrub brush into the solution and scrub the siding to remove dirt. Rinse with clean water. Let the siding dry in the sun.

Cover any windows, doors and trim with plastic sheeting and low tack painter's tape. Apply the tape to the windows and then cut the tape with a utility knife to create a sharp line between the window and the siding.

Remove loose and flaking paint with a metal scraper. Hold the scraper at arm's length from your body and pull the scraper toward you to remove the paint.

Attach medium-grit sandpaper to an electric sander. Sand any areas of the siding that are uneven or have a large area of chipped, flaking paint. Sand the siding until it is smooth.

Set out tarps to protect the sidewalks and patios from paint splatter. Stir good-quality exterior paint to thoroughly mix it. If you are painting a large area, mix several cans of paint together to prevent color variations.

Paint the trim and the small crevices of the siding with a trim brush. Work on one wall at a time.

Roll a short-nap paint roller through the paint and apply it to the siding in a thin, even coat. Allow the first coat to dry.

Apply a second coat of paint. For new, pre-primed siding, James Hardie Siding Products recommends one coat of paint. For previously painted siding, you may need a second coat for complete coverage.