This is just a question about a product. Has anyone used Forever Black Tire Gel dressing? Its a black pigmented polymer dressing that claims it WILL RESTORE THE FADED BRONZE LOOK OF YOUR TIRES TO THEIR ORIGINAL APPEARANCE. Claims to last 3-4 months. It says not to get it on white letters! Just wondering if it works very well and is there any drawbacks to using it? Roger 70 gt500