After three years of making hot and cold process soap, I have been approached to make a shaving soap for a local barber shop. I've spent some time researching only to find out I actually need to use a 60/40 percentage of KOH and NAOH as well as stearic acid. My only problem is that there doesn't seem to be a soap calculator that lets me work with both chemicals. If I use Soap Calc and work out the recipe first for the NAOH and then for the KOH, how do I know how much water to add as each one shows a different amount. If any of you out there has any tips for me I would be most grateful!