What do you guys think of undercoating/sound deadener on new cars? I know Toyoya has excellent rust protection from factory on the undercarriage and frame , but don't know whether to get it undercoated with sound deadener once I pick it up. In the past on some of my vehiclles I have purchased ''Rockergaurd'' coating in the ''rattlecan'' and have applied this product to the frame and areas of the undercarriage with great results!! Looked great years later. This was a very inexpensive means to protect the frame.