Go and get you some stove rope .Its the best and will last a long time .Only do the bottom section ,no need to do the lid .
Use high temp ultra copper rtv silicone ,made by permatex.
clean bottom surface real well ,then wipe down with mineral spirits ,make sure the grease is gone on the surface.scuff the bottom surface with a wire brush of sorts before applying adhesive.
LOve to grill and eat .
The balck oval primos x tr lrg
4% of something that tastes like nothing is probably not needed.