How to protect patio furniture from sun

The short answer

The most effective way to protect patio furniture from sun is to stop the sun reaching it: shade it with an umbrella, a pergola or an eave, and cover it when it is not in use. Everything you can apply to a surface is a distant second, and on some materials it does nothing at all. That is the honest version of this answer, and it is the opposite of what most advice implies, which is that the right product solves fade. The right product helps on specific materials. Shade solves it.

What UV actually does

Sunlight damages outdoor furniture in two distinct ways, and they call for different responses:

• Photodegradation of the polymer. UV photons break the chemical bonds in plastics and synthetic fibers. The material becomes chalky, then brittle, then cracks. This is structural damage, it is irreversible, and it is why a cheap resin chair snaps in year four.
• Pigment breakdown. UV destroys the dye molecules, which is fade. It is cosmetic, and whether it matters depends entirely on where the pigment is — on the surface, or through the material.

Heat and moisture accelerate both. That is why a south-facing deck in a hot climate ages furniture much faster than the same furniture in a mild one, and why the AAMA weathering specifications use South Florida exposure as their benchmark — AAMA 2604 requires five years of it, 2605 requires ten.

What fades and what cannot

This is the whole argument for buying fade-resistant material in the first place rather than managing fade afterwards. HDPE carries its color and UV inhibitors through the material, and solution-dyed acrylic has the pigment inside the fiber, which is why the Sunbrella warranty can be written against fade at all. Our fade-resistant roundup covers the buying side.

The routine

1. Shade it. An umbrella positioned for the afternoon rather than for noon does most of the work, because the low late sun is both the harshest angle on seats and the hour the patio is used. See umbrellas for sun protection.
2. Rotate and reposition. Turn chairs and swap cushion positions through the season so one face is not always aimed at the sun. Even fading reads as patina; one bleached side reads as neglect.
3. Clean first, always. Protectant over pollen and body oils bonds to the dirt. The method is on our cleaning guide.
4. Apply the right product for the material. A UV protectant for plastics, vinyl and rubber on synthetics; penetrating oil on teak only if you want to hold the color. Never a film finish outdoors — our oil versus varnish page explains why film finishes fail.
5. Store cushions out of the sun. They are the fastest-fading part of any set, so this one habit changes more than anything else you do.
6. Cover it for the off-season, once the furniture is dry. That removes a large share of the set's lifetime UV exposure in one step.

What does not work

• Sealing HDPE or poly lumber. There is no surface finish to protect and nothing for a sealer to key into. It will collect dirt and nothing else.
• Varnishing teak to stop it silvering. A film finish on outdoor wood cracks as the wood moves, water gets underneath, and the finish lifts. Penetrating oil or nothing.
• Fabric protector sprays for fade. They are water repellents. They do not block UV and they do not restore dye.
• Protectant on already-chalked plastic. Chalking is degraded polymer at the surface. A protectant will wet it and make it look better for a fortnight. Restoring it is a different job — see restoring faded furniture.