 So it doesn't let that sun beat it up as bad as it would, say, just a straight polyurethane. So there's some inhibitor in there, UV inhibitor. So really, if yours has been up there for a while and you 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.