How to Paint Outdoor Furniture | Paints That Last Outside

One weekend of solid prep and two coats of thin paint can take tired furniture from scrap to centerpiece. A freshly cleaned, lightly sanded surface and the correct primer for wood, metal, or plastic separate a five-year finish from one that peels by spring. This article covers the exact process for each material, including professional prep tricks.

Prep Work Before You Paint

Every job starts the same. Wash the piece with warm soapy water or a mild TSP substitute, rinse with a hose, and let dry completely. Remove loose or flaking paint and rust with a wire brush or sandpaper. All three sources agree: you cannot paint over dirt, oils, or failing old paint.

Sanding creates grip. For wood, use 80-120 grit sandpaper. For metal, fine-grit sanding or a steel brush knocks off remaining rust. Plastic needs only a light scuff with fine sandpaper — aggressive sanding can scratch it. Wipe all dust off with a tack cloth or damp rag after sanding. Remove hardware when possible; if paint gets on it, a hot water bath can lift it.

Primer and Paint Selection by Material

For wood, apply an exterior primer to seal the grain. Paint the underside first to avoid sticking. For metal, use a “rusty metal primer” even if it looks clean — unseen micro-rust spots can bloom later. Sherwin-Williams suggests two thin coats of outdoor paint after the primer cures. For plastic, skip standard spray paint; it will crack. Little Greene advises priming with its All Surface Primer, then two coats of its outdoor plastic paint. For help choosing, our roundup of the best exterior furniture paints can help.

Best Application Techniques

Paint top-down so drips don’t mess up finished areas. Use thin coats; thick paint drips, pools, and dries slowly. Use an artist brush for corners and a small foam roller for flat panels, per Sherwin-Williams. Graco advises long, even strokes with the grain when using an airless sprayer. Keep the spray gun or can moving to avoid pools. Let each coat dry fully — at least a few hours, longer in humidity. Two thin coats look better than three rushed ones. Wait 24-48 hours before using furniture; full cure takes days to weeks.

Weather and Timing Considerations

Paint in mild temperatures, low humidity, and little wind. Avoid direct sun — it dries paint too fast, reducing durability. Ideal conditions: about 21°C (70°F) and 50% humidity or less. Avoid rain for 48 hours after the final coat; if weather turns, move to a ventilated garage. Protect the ground with drop cloths. Common mistakes: skipping cleaning, not removing old paint or rust, thick coats, painting in sun or high humidity, and using regular spray paint on plastic. Avoid each for a finish that holds for seasons.