I find that eo's thicken up less quick than fo's. So I poured the eo one into the bottom of the log mold, then went back to the second, unscented half in the pot, and noticed that it was already quite thick, unscented. I added the fragrance oil anyways, stirred like a madwoman, and glopped it into the mold on top of the eo soap.
Two hours later, feeling uneasy about it, in case the fo didn't mix in well enough ( I usually add fragrance at light trace, not to thick pudding), I lifted the lid.
* I typically never peek before 12 hours are up.
As suspected, the fo was pooling all over the top. So I scooped the entire contents of the log, eo and fo both, and glopped the whole mess into a ss pot. Put it into the oven at 250 and cooked it for a half hour.
This meant stirring and mixing the eo soap and the fo soap together, which was not my intention.
I think the soap turned out ok, but I would have preferred layers.