Smooth-On Rebound 25 Silicone Rubber - 2 Jars, Gallon

First time user of this product. I had a cross with an area of 600 plus sq. In". I did the calculations, and applied 5 coats and used every ounce of 2 gallons. By the time I applied the third coat and got the hang of it.made a fiberglass 2 piece mother that will work, when I and some thickness in a spot I got a little thin.. I'll use this mold as long as it will last, but I'll need 4 gallons, I want it 8 layers thick due to its size. Oh, and no tape will stick for long, or not at all. The only thing that stuck was clear packing tape. It did the trick for building the 2 piece. Great product! I'v already purchased more, and will get another to build my second mold but I think I'll get the rebound 40 for a stiffer exterior!