Superfatting is very simple. If you use soapcalc.com I think it defaults at 5%. Then just add the oils all at once and it is done. Some like to superfat by adding some additional oil later in the process but I think most combine all the oils at once. A 5% superfat means you have added 5% more oil than what the lye will take care of.
What BigMoose said...
I would only add that it's best to ALWAYS include your suprfat into your calculation... that way you know what you are dealing with and can repeat it or more easily tweak it later.
Adding "a little extra" oil to your recipe is just a crap-shoot.
And just to confuse this issue even more, is there any guarantee in hp'ing that if you add oils after the cook they will be your superfat oils? Or is there still some active lye?
And just to confuse this issue even more, is there any guarantee in hp'ing that if you add oils after the cook they will be your superfat oils? Or is there still some active lye?
I'm not 100% sure, I've only done HP a couple of times... but I believe that once it is cooked the lye is gone and any oil you add at that point stays as oil. I think you just need to be careful not to go overboard so the extra oil doesn't seperate or go rancid.
I use SoapMaker and it calculates how much lye each individual oils/fat/butter takes to saponify so when I ask for my SF I know it's correct. I believe that all Soap/Lye Calculators work this way as well....