After a bit of time your pipes do start to rust under the wrap. I rewrap mine about every year, the wrap starts to fade, or it gets torn, or just looks dirty, wrap is cheap and is simple to do. Ceramic coating is usually much more expensive. Get your header off, paint it with exhaust paint, let it dry, then go to town with some exhaust wrap. Remember if you are wrapping it, start from the rear and wrap forward!!!!!!!!
DJ