Here is the description. The part that concerns me the most of highlighted towards the end of the paragraph.
At last there?s an answer to one of the oldest questions in the motorcycle industry ?How do I keep my exhaust pipes from blueing?? The answer is DYNO-KOTE?, available exclusively from Custom Chrome?. DYNO-KOTE? is a specially-formulated internal exhaust pipe sealer which forms a protective heat barrier that minimizes blueing in most exhaust systems. As part of the installation process, DYNO-KOTE? actually bonds itself to the walls of the exhaust when exposed to high exhaust temperatures. DYNO-KOTE? may only be used in new exhaust systems which have not been previously run, and installation is as easy as pouring it into the headpipes and rotating them until they?re evenly coated. When properly installed, your exhaust pipes can retain that ?new? look for thousands of miles and not just a few hours like unprotected pipes.
Note: This product should not be used in any exhaust system which has built-in anti-reversion cones (i.e., ?Python? or CustomChrome ?AR?? pipes), nor should it be used in SuperTrapp or Rich Products ?Thunderheader? exhaust systems. There is no practical way to drain the product back out of the headpipes past the anti-reversion cone without plugging it up and rendering it useless. Pipes may still blue slightly if installed on a motor that is improperly jetted or timed, or the choke is left on for extended periods of time. Exhaust systems with extremely sharp bends coming out of the heads may also discolor or blue slightly. Complete kit (includes two 8 oz. bottles and brush)