Blackfire Wet Diamond works great - but I have only used it once. As with any of these products, proper prep (clay) is key to obtaining optimal results. On the vehicle I used it on, it lasted almost 6 months - but the car was rarely driven and garaged. Most of these "creme" type paint sealants will hide defects and swirls for a short period of time (couple of washes) due to their oils, so this may be of interest to some people.