I thought ALL gaskets were fiberglass (like what you can see on the doors). Those are very different from the ceramic everburn chamber stuff. If you are talking about fiberglass gasket, then it should not crumble to dust when squeezed, basically it should feel like the gasket in your doors. And why are you paying for something that should be covered by the warranty? Did they tell you it wasn't covered? If so, what was their reason. I'm just curious.