Has anyone tried Blue Devil Rear Main Seal Stop Leak?

When I bought my 66 Valiant it had 126K on the untouched original motor and it had several leaks. I used some stuff from Lucas called Engine Stop Leak. Engine Honey from Casite is a similar product. This stopped the leaks but it's for sure a temporary fix. I was OK using it as the engine is getting rebuilt so I bought some time is all. I wouldn't do this as a permanent fix - JMHO. If the rest of your motor is in good shape the right fix is to replace the seal and while it's possible to do this in the car, it's way easier to pull the motor and do it on a stand. The rear main can be either a rope or rubber seal, the only way to know is take it apart.