small amount the key word like .a very small bit . like with a tooth pick . and not on the taper seat if it is that type of nut. but on custom mag on the shoulder this is not eschew this keeps the mag nut from gulling and in no way working on the torque it is on the side of the nut not on the inside or on the stud or on the washer and yes if the law is do not do it. do not. but i do not think it is that bad . use some common sense. like guys asking for copper to make brake lines BAD and watch the parts guy sell it to him