Similar test on my 2004 CTS-V showed the same results as yours. I found it did help slightly but not any better than a good wax. Otherwise as stated its not worth the cash.

Most CTS-V guys are running Hawk HPS pads to reduce some of the brake dust over stock. Slightly better stopping power as well.

Thanks man. I will look them up.

OTC= DO NOT BUY. A product made for the masses will never have the costly make up of a high end product.

In the end it is like anything, more effort will produce better results(dis-mount wheel/polish/seal with high end sealant such as Powerlock or blackfire) Rejex repels really well, but the optics are just not there especially if you have gloss black wheels.

I tried this product a couple of days ago and I am very impressed with it....As most know with the Z06 after 20 minutes the wheels are covered in brake dust......So far mine are 95% dust free after 3 days.

Hawk HPS brake pads are the key against dust.