If u hv film u'd probably wouldn't need diamondbrite, and vice versa. I hv diamondbrite, and it works. However there is a conserver which must be applied every month to maintain the shine - just add to water, apply with wet sponge and wash away, that simple. However, if you need to respray parts of the car, you will have big big problems. Apparently, the paint doesn't stick after application of diamondbrite, and there is almost nothing that they can do to remove it. My paint guys used kerosene to wash almost 10 times, and with Jif and all sorts of things. Otherwise, the paint keeps having bubbles after application. Very very frustrating for those intending on a paint job ........ but further testimony that it works, I guess...