I am doing my first pot melt and am tyring to figure out how much glass goes in there so it will not over flow. I am using a 4.5 inch diameter by 1 inch height ring and for the glass I am using a stainless still vegetable colander I got at a garage sale for 50 cents. I have fiber paper on the ring , wash on the colander, just not sure the amount of glass to put in.