I take a mast section and clean up the inside.
Then wax it ( 5 times) than put on pva.
With the section on its side layup ten layers of glass (with epoxy) on the bottom, when it is mostly cured (still sticky) rotate the section and do the other side. Do this most the way round, I leave a gap at the mast track area. When it is fully cured use wood shims to pry it loose.