Jetfreak,

David has got it on the nose! The 3M plastic fine line tape is the NUTS! Have yet to have a bleed through using that stuff.

Nikita,
You should only have to primer the inside of a jet if it is ducted fan, turbines should not need it. Due to the amount of fuel/oil that ducted fans tend to blow inside the fuse it is just extra protection from breaking down the glass/resin over a period of time. I use a good epoxy primer for this.

Todd