I like Kwik Kick. I like that at the almost hard stage (B?) you can stick strands of cloth together and they will stay, saving some sanding before flipping.
I was doing that today and semi-nursing the corners of a board and it occured to me that with KK, I could wrap the tip with tape and walk away. You can too.
(this one is a twin fin with a small trailer, so no remarks about the fin setting )