An interesting fact was brought up to me by the Technical engineer for Divinycell. Priming H80 foam takes 300gram of epoxy per sq metre... thats 300g x 8.5sq m for the hull's outside alone... 2.55kg! Another 2.55 kg for the inside as well...

Weight of hull calculation
cloth inside and outside (200g/sqm ) = 3.4kg
epoxy to saturate cloth = 3.4kg
Diviny cell H80 10mm thick = 6.8kg
Epoxy for priming both sides = 5.1kg
Reinforcement ( estimated ) 1.3kg

Total = 20kg