 So really, if yours has been up there for a while and you've got a lot of sun that hits it and you want to stay ahead of the game, when I say it gets little pinholes in it, you need to address that area where you can eliminate that pinhole. And how do you do that? You wash the door down. Get all the dirt off it. Get some 600-grit wet, dry sandpaper. It's black in color. Get a bucket of water.