Here's a thread... but maybe it'll be important for you next year...
Vinylester Resin - Barrier Coat
I just want to emphasize one thing. I think it's important to not apply barrier coat to bottom paint...I also know how hard it is to completely get bottom paint off... I'm not a bottom expert. Search this forum.. you will find good info...
For the record... I was looking for 10 years of protection.
I went for 14 coats of epoxy...(2 then 12 Interprotect)
3 coats of bottom paint (1 hard 2 soft... Petit)