Hi Daz,
No you dont have to remove the purple. Just all grease etc.. and smooth out any marks for a better finish.
I dont do the Hydro-Dipping its RichyUK on here that does all my stuff. There is a waiting list but worth the wait.
I have done the purple plates today, but these are not Hydro-Dipped. I have another set of Cougar works plates being Hydro-Dipped in Black/Silver carbon.
But I think I will use these Chrome purple plates I did today......
