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For my 2005 Corolla that had greying on the windshield cowl, bumper protector, etc. I used Cerakote Trim coat and followed instructions. Two years later and still deep black. It adds a very slight sheen.

On our new Rav4s, I use 303 UV protectant spray to prevent or slow down the greying. I use it on all black plastic and rubber on the exterior and the plastic and Softex on the interior. I try to do this every 2-3 months Except for the cold winter months.

Our vehicles are parked outside. No garage
 
this is what i put on my 2018 ram that has sat in the sun for 8 years. only apply once every 3 years.
 
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