Hull fragility became an issue. I had major problems with one hull and ultimately I ground off 0.030 inch of gel coat and applied 6 oz s-glass over the entire bottom with premium no blush epoxy. I painted that with Brightside white polyurethane. So far it is one tough son of a gun and I don't think I added more than 5 pounds.
That is one way to do it ! <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />
Good to hear your problems in this field are over.
From what you tell, it shouldn't affect any of the F16 sailing characteristics.
Best of both worlds !
Wouter