IÃ¢â‚¬â„¢ve build my first kiteboard with the vacuum bagging principle. The board came out very nice, except for a few air bubbles on the bottom of the boards
I use self adhesive PTFE coated glass fibre on the rocker.
(from AeroVac in UK), expensive but worth every penny.
Its slightly porous so it allows trapped vapours to bleed away.
Also its tricky to lay on curved surfaces but gives excellent release
every time with a class A finish. I use prepreg but should work on wet layup as well.