Remember guys: the BVM Heat Shield stuff is just a fire resistant coating. It offers almost no insulative capability. It just does not support combustion. It will not keep anything that it is coating from getting hot, just from burning. The thing it coats will still get just about as hot with or without it. It may insulate enough to give a delta of a few degrees F, at the most. It just keeps direct flame away. So if the glass/epoxy pipe will get real soft at the temperatures it gets to without the Heat Shield, it will still get that way.