In prehistoric days it seemed we used dilute Muratic acid on rubber installations. ( Ru-glyd ?) it was slick when applied but dried ... also I think we used to measure the working position of the part( contol arm for instance ) and have it in that location when installing the bushing..so as to not have it cocked in tension when in static mode ( sitting around ). It was also used to spray on rubber bushings to keep them from drying out... or so we thought... and it did stop many a squeak on old cars... Greg, remant from prehistoric period...