No clear fitting instructions came with it but my painter advised he would rub the gloss finish off so as the glue would have a good connection and stay put, last thing i wanted was my new shinny £275 spoiler flying off at road speeds....
Thanks yes will do, personally didnt want to go the other spoiler route, just not for me. Beware not enough glue comes with it and its best to key the top of the tailgate to get a good fix. ;)