I'm still confused about super fatting. From what I understand you are decreasing your lye solution and adding more oils/butters. Is that correct? When do I add the additional oil/butters? When I mix my oils or butters together or after I've traced?
So, this comes from people using the terms super fat and lye discount interchangeably, when they are actually different. TOMH (I think) explained it all in a post somewhere - but I don't have the time to go searching so I will try and sum it up.
First off, you either decrease the amount of hydroxide (Na or K) you use - OR you add extra fat - you do not do both.
a lye discount is used in cold process - because even if you add extra fat at say trace - it is still going to go thru saponification. You basically use less caustic than you need to saponify all your fat. So it is just easier to throw is all in up front - that way you do not forget it.
Now, you can use a lye discount in hot process. Again, you use less lye than needed to turn all of your fat to soap. Works the same way. All the fat up front.
Super fat is when you add extra fat to a soap once saponification is complete. You can really only do this with HP since once the reaction is complete with CP you have solid soap (I am sure there are exceptions but generally for us hobby soapers this is true) - but with HP you can add oils to the soap after the cook. HP soap is not solid until it cools. So you can add in oils at that point and mix them in.
So in CP soap, add all your fat up front.
If you want a certain fat left over, you have to HP and add the fat after the cook and the soap does not zap.