don't know that most folks use anything, but on one project I brushed on some "Plasti-Dip" for a sort of built in gasket - pretty easy, cheap [had the stuff already!], can't hurt

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot