Grumpy girl, if you want 1-1/8" thick bars, use 45 ounces of oils. If you want 1-1/4" bars, use 50 ounces. For you, you mentioned 1-1/2" bars, so use 60 ounces of oils. Deb was right on!:highfive: Hope this helps. The more you use this mold, the HDPE gets seasoned, which makes it easier for the soaps to slip out. I turn my mold over, shake a few times or drop it a few inches above the table, and the dividers and soap falls right out. I just take a paper towel to the sides, and wash the bottom liner in warm water, if necessary. For the first time, you mar wipe the HDPE down with mineral oil, or spray with a coking spray. Paul