Have heard this before. Never have I tried it. With modern metals, I wouldn't. Its not near as poreous as a old blackpowder barrel to hold the materials to make it foul less.

Marvel has alot of by products that might scare me to do this. I don't know the chemistry of it but I thought it had some metals in it. Might pit your bore. Might not. If you decide to try let us know if it fouls less. I am always open ears to learning a new trick.