I looked this up, it's interesting. Not something I'd want to try but seems to have varying results. Aside from being abrasive I wonder how much acts as a filler. Would any get forced behind the rings for a tighter seal as well?Okay story time .Ford up until about 10 years ago "hot tested" every engine before it was installed in a car ,ran them tested them etc .Oldsmobile never did ever .The first time the engine was fired was when the car came off the final assembly .They would dump a teaspoon and a half of Bon Ami down the carb throat which would instantly seat the rings .They built a pretty good engine at one time .