anything will discolor over time, although there are a number of 'favorite tricks' to prevent it on different materials - the ceramic coated is my preference - clean up your plain ones and lay on a coat of exhaust paint

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