It's 12-14 yo Integra insert. The glass was smoking up pretty quickly, so I installed a new door gasket, and put RTV on both sides of each glass gasket. It seemed a bit better, but still had gray, black streaks in less than a day. I noticed that the top of the glass pieces were not sealed, and had no means to be sealed, so I put RTV along the top of them. NOW the glass turns uniformly white / light gray within hours. It looks like I sprayed it with that glass frosting stuff in a can. The heat output seems fine, even at well below zero. I'm thinking I should UN seal the top. Any ideas?