Using my SFB on my Chargriller duo. I want to seal the lid on the main chamber on the duo so the smoke from the SFB will stay inside the main chamber. I tried to use Rutland 5/8 wood stove seal rope with their high -temp cement. I installed the seal slowly, clamping the seal in place as I went slowly around the chamber lid. It seemed to set and I started a fire to break it in and all went well. 3 days later I went out to my grill, opened the lid, and the seal fell off!! the cement was wet like it just came out of the tube new. I screwed up at someplace in the install, not sure what it was. So what do you guys use to seal your lid better? Should I give Rutland a second chance?