fiberglass barrier coating-Osmosis preven

      I just read INTERLUX boat paint book and they want me to seal inside of hull after i get all foam out, to create a water barrier. 1ST put on a primer then coat with a topcoat paint--also they want a barrier on outside of hull below waterline.
        Any Thoughts on this?

Scout,

Does the boat have exterior blisters? Does it appear that water saturated the foam purely from cracks in the interior floor? Do you intend to keep the boat on a lift or trailered when not in use. Blisters and osmosis is generally the result of the boat sitting in water for extended periods of time or conversly from the boat haveing water sit in it for extended periods of time.

Once you have the floor refoamed and glassed the need for barrier coating is more dependent on "how" you intend to store the boat when not in use.