PolytekPlatSil 73-15 Platinum Silicone Rubber (2lb Kit)

Link shows use equal amounts but it's by weight not volume according to directions inside box. I had purchased for a large project and the scale wouldn't go passed a certain weight so I had to pray it's work. It is pretty expensive. I used nearly both bottles which are smaller than appears in photo to make flower pot mold and tray. I would recommend using its for smaller projects. It is very thick. I had to cut mold to remove original pot I used to copy.