I'm not trying to be a wise guy George but I don't understand your response. I'm not going to fly any of my boats and where are you getting "FREE" resin? Or did I miss your point? And as far as the 'glass/resin compatibility concern: Raka sells 'glass too.
> Homebuilt aircraft plans usually indicate that no substitutions
> are acceptable to the epoxy/fabric specifications.

> The reason is that unless you test the epoxy/fabric you MAY not
> get adequate performance.

> I don't believe in testing but a good test schedule would consume
> weeks of time to let the epoxy cure and $50 of materials at least.
>

> The difference in cost between .75 gals (1 boat) of MAS epoxy
> resin plus hardner ($50) and FREE is not worth my testing time.

> For the record I have someone custom mix my epoxy resin and hardner.
> It costs me $100 per boat.