How to Operate an Airless Sprayer

For large-scale painting projects, an airless sprayer provides the quickest and most efficient paint application. It works by using an electrically powered hydraulic pump to draw paint from a container, pushing it through a hose, and out of the spray gun onto the surface. Once you get the hang of it, it's straightforward to use, but make sure to obtain written instructions when renting one.

The instructions will guide you through flushing the system with solvent (typically water or mineral spirits depending on your paint) and pumping paint through the hose into the spray gun. For cleaning, reverse the process: Pump out the remaining paint and flush with solvent.

While you'll only need the sprayer for a day or two, allow at least one extra day to properly mask off everything you don't want to paint. Secure drop cloths to all floor areas, cover windows, doors, and the fireplace, and remove or mask hardware. Don't forget to mask switches and outlets. The spray mist from the sprayer travels easily in the air and may settle on nearly every surface in the room.

Make sure to keep at least one window open in each room and set up an exhaust fan to help remove paint fumes from the space. Don’t forget to wear a painter's mask, a hat, and old clothes with long sleeves to protect your skin.

Airless sprayers come with filters to prevent paint particles and debris from blocking the spray tip, but it's a smart idea to filter the paint through a nylon stocking or a paint filter before pumping it through the hose.

Proper Use of an Airless Sprayer

Using an airless sprayer requires practice, so take time to try it on scrap plywood or a hidden area of your room or house. The goal is to apply an even coat of paint across the surface. Keep the spray gun 6 to 12 inches away from the surface, maintaining this distance throughout each pass. Hold the gun perfectly parallel to the wall. Avoid sweeping back and forth, as this will create a wide arc of paint with the heaviest concentration in the center and thin or transparent paint at the edges.

Paint a 3-foot wide horizontal strip at a time, then release the trigger and move down to paint another strip of the same length. Overlap the first strip by one-third to one-half. Once you've covered the entire 3-foot area from top to bottom, move back to the top and start the next section next to the first, overlapping the previous painted area by several inches as you continue down the wall.

Inspect the painted areas to ensure an even coat of paint across the surface. Too much paint will cause drips, while too little will let the old paint show through. If you notice these issues, it's likely because you're not maintaining a consistent distance from the wall or are tilting the gun. Tilting upward will result in excess paint at the bottom of the strip, while tilting downward will concentrate the paint at the top of the strip.

To avoid paint buildup at the end of each strip, release the trigger just a moment before the spray gun stops moving. When starting a new strip, begin moving the gun a moment before pulling the trigger. Always keep the gun in motion while spraying.

Ensure the paint is properly thinned and the pressure control is adjusted according to the manufacturer's guidelines. If the paint is too thick or thin, or if the pressure is incorrect, the paint won't atomize properly.

Airless Sprayer Safety Tips

Airless sprayers are highly effective and efficient, delivering pressures of up to 3,000 pounds per square inch. This force propels the paint through the spray tip at speeds of 100 to 200 miles per hour. However, this immense power can be hazardous. Therefore, always treat the sprayer with caution, adhere strictly to the manufacturer's guidelines, and take the necessary safety precautions to avoid accidents or injury.