How to Protect Car Paint From Sun Damage

Four different failures, four different timescales

“Sun damage” is four separate problems that happen to share a cause. Clear coat oxidizes and eventually goes chalky and then peels, which takes years. Single-stage paint on an older car fades, which takes less time than that. Black plastic trim turns gray, which can happen in a single hot summer. Headlight lenses yellow once the factory UV layer on the outside of the polycarbonate gives up. And inside, dashboards and door tops harden and crack.

They do not fail in the order you would expect from the price of the parts. Interior plastics and headlights usually go first, trim second, paint last. That is why this page spends more of its product budget inside the car than on the hood.

Almost nobody publishes a UV figure

This is the finding that shapes the rest of the page. Across the paint-protection products in this ledger there is not one published UV rating, UV transmission figure or SPF-equivalent number. Makers say “UV protection” and leave it there. Collinite are unusually specific about everything else and still treat UV as one item in a list of elements alongside rain, snow, salt and grime. 3D say their GLW Series Ceramic Wax protects from UV rays and publish neither a size nor a durability figure to attach it to.

So the honest basis for a sun-protection recommendation is not the strength of the UV claim. It is whether the maker publishes a durability figure and a coverage figure, because a layer that is actually present on the paint in August is worth more than a stronger claim you applied once in March.

On the paint, reapplication beats the claim

Collinite No. 845 is the pick here on arithmetic rather than chemistry. 16 fl oz at $22.99, 4 to 7 months claimed, and a published average spread of 1,200 to 2,000 square feet: that is the only product on this page that lets you work out the cost per car before you buy, and the answer is small enough that there is no excuse for letting it lapse. Collinite are also straight about their own range, giving the highest level of UV and weather protection to the No. 476 paste rather than to 845.

3D GLW Series SiO2 Ceramic Wax at $34.99 names UV protection and works as a stand-alone wax or as a topper over an existing coating, which is a genuinely useful position: the coating does the hydrophobics and the wax is the layer you refresh. 3D publish no size and no durability figure, so you cannot plan a reapplication schedule from the label.

If you want the longest-lived paint layer, that is a coating rather than a wax, and the coating roundup ranks them on published durability and consumption. How long a ceramic coating lasts is the realistic version of those numbers.

The dashboard is where you will see it first

A cracked dashboard is permanent, cannot be polished and costs more to fix than every product on this page put together. 303 Automotive Protectant publishes a UV protection claim for vinyl, rubber and plastic plus protection against fading and cracking, and describes a non-greasy finish, which is the pair of properties that separates a modern protectant from an old-style dressing. What it does not publish is a UV rating, a durability figure or a list price.

Chemical Guys VRP is $11.99 for 16 oz, states UV protection without a rating, and is sold on a deep black finish with enhanced shine. That finish is the catch: a glossy dashboard throws reflections into the windshield on exactly the sunny days you bought it for. The dashboard roundup covers the matte options, and 303 against VRP is this choice on its own.

Trim and headlights

Gray bumper trim and mirror housings are the most visible UV damage on a car and the cheapest to reverse. The trim restorer roundup covers the products that put the color back, and the trim coating roundup covers the ones that then stay put for a season or more instead of washing off.

Headlights yellow because the factory UV hardcoat on the outside of the lens has failed, so sanding the yellow off and stopping there buys you one season. The Chemical Guys Headlight Restoration & Ceramic Kit at $24.99 includes a ceramic step after the restoration, which is the part that matters; Chemical Guys publish no coating durability and do not say how many lights a kit does. The headlight kit roundup compares the field.

Who should buy what

• A car parked outside that you will actually re-wax: Collinite No. 845, $22.99, the only product here publishing both a durability range and a coverage figure.
• A coated car that needs a refresh layer: 3D GLW Series SiO2 Ceramic Wax, $34.99, which 3D publish as a topper as well as a stand-alone.
• A dashboard you want to keep uncracked and matte: 303 Automotive Protectant, which names UV, fading and cracking and publishes no gloss claim.
• One bottle for interior plastics, exterior trim and tires: Chemical Guys VRP, $11.99, accepting the deep-black shine it is sold on.
• Yellowed headlights: the Chemical Guys kit at $24.99, because it protects the result rather than just sanding the yellow off.
• Skip VRP on a factory matte dashboard. The finish it is sold on is the opposite of what you have.
• Skip all of it as a substitute for shade. A carport removes more UV than anything on this page, and it does not need reapplying.