I used the HSRF very sparingly on my 33. only used it to fill holes that I miss-drilled and also a couple edges to build up 1/8" max.
The question is I've seen a lot of old posts saying it wont stick to gelcoat. I've feathered it onto the gelcoat and it sticks incredibly well. The 3m website shows all the uses for it going directly over gelcoat and feathering in so I cant see the reason for it not to adhere permanently?

Any experts who can weigh in?

-tony