we just put 8 oz. cloth on the CS-15. We were able to put all the weave filling coats on in one day, the only way to do it. Like was said previously, you need to work the cloth on with squeegees so that it is as smoothly as possible, no wrinkles, wraps etc. Then when you get the weave filled, all you have to do is sand it and you should be ready for primer, depending of course, on the level of finish you are after.
As far as glass or no glass, you should at a minimum glass all the joints. All over, the glass just gives it a little more abrasion resistance, and probably some minor increase in strength. Definitely glass all the joints at a minimum. Bill CS17#34