the cap is stainless steel. it will handle the heat. I welded on mine. Filled the hole, then redrilled it higher. then torched it to color it. DIdnt like it so just sanded it back down for a brushed finish. But dont worry about the heat hurting the cap. Powder coat would work just fine. Make sure none gets inside or in the drip tip hole or you will have fitment problems. Will have to rebore the air hole afterwords to get any powder coating out of it also.