hawk

I was checking out some detailing supplies today and I saw this product called "Black Magic Tire Tint" that costs around $6. Basically you rub it on your tire sidewalls and it gives them a bit of color. It says that when the sun shines on your tires they will shimmer in the color you buy and that the effect lasts a few weeks. Has anybody heard about or tried this product? I'm unsure if it would look weird or not since the tread would still look regular. Not sure how bold the color would be either.