Hrm... Is "1/2 oz. glass cloth" 1/2 oz/ per square yard? I've been considering a foamie type slope soarer, but I think I might want to glass it rather than use ultracote, if it's not too heavy. At 1/2oz per square yard, I'd still have quite a bit of elbow-room for polycrylic and maybe even a bit of paint before it gets heavier than ultracote's 2.3oz per square yard.