Optimum Opti Seal or FK1000. Booth hi temp sealants, i've used booth and found Opti seal is easier to apply but requires a little more buffing if you spray too much on. Took mine off and gave them a few good coats, still rinsing off pretty much (tho i don't do a lot of miles ) Speak to Alex as Moleman said, he will sort you outAnyone found a good product to put on the pipes to prevent soot build up or at least make it easier to clean off? Only takes a small run for it to build up after a wash!!