: 6OZ. glass on the underside as an abrasion gaurd is a good idea here and little weight.
: I assume the underside will be hit by waves etc so it's better safe ...IMO.
: Now if it was glass reinforcing ,that would be heavier glass (18 oz )and a bad idea I agree.
Its your boat, and I have no(!) experience of cat sailing, but Richard Woods does. You could ask him.
Mike Sales