My 92 Cooper G-1 has creaked since day one and I don't mean just a little. I thought I had given it a coat of Pecard leather dressing when I got it but I may have been using Lexol at the time. Anyway it sounded like a couple of sumo wrestlers going at it for the sumo wresteling championship of the world on an old leather sofa anytime I would move in it. So I rubbed in a light coat of Pecards on every millimeter of the leather, then I slipped it on and it didn't make a sound. Couldn't make iit creak no matter what I did. So, how long should I let it soak up the Perdards and how long til the creak returns?