DIY high temp gaskets, this is what I use and they work excellent. I had a old welding blanket that I cut
into strips then I spray the strips with contact glue and roll them into a tube. They will form to make a good seal.
nice!!
For those that have not used a welding blanket,or don’t know what they are.
Here is a link.
http://www.mytarp.com/3-x-4-welding-blanket-silica-dioxide-18-oz.aspx