I'm preparing to filled some hollow sections with EG. The inside of the hollow section is not greasy to the touch but there is a with a black substance that is powdery to the touch. Just like when we touch the side of a exhaust pipe.
I tried removing that substance with some turpentine soaked rags attached to one end of a hollow bar which worked okay for areas near ends of the hollow sections. But cleaning the entire inside of the hollow section is a real pain as it is difficult to reach all the areas inside with sufficient pressure to remove the substance.
Will that black powder substance prevent the EG from adhering properly to the hollow section?