+1 for the 3M with the green letters, worked amazing on bringing back the hull (white) of my 1996 SeaDoo GTX, took 2/3 passes though.
I recently just did my 21' Crownline that has some black and some white. I used purple wool pad with
M105 on my
G110, worked wonders, never thought I'd see the black that black, however, it didn't work wonders on the white...evened it out but didn't get an amazing shine. Good Luck