What do you want to know post, Katie Z asks: I've been wondering what would happen if I used two complete emulsifiers together in one formulation. This came up because I was looking at your emulsified scrub, and it calls for 10% emulsifier. I use Olivem 1000 [INCI: Cetearyl Olivate (and) Sorbitan Olivate], and the recommended usage only goes up to 8%. I haven't been able to determine whether that's a safety issue or a general recommendation. So I was thinking about using 8% Olivem 1000 and 2% BTMS-50. But I didn't know if doing that would cause some kind of catastrophic failure.
I've also wondered if I could alter the skin feel of my creations by combining BTMS-50 and Olivem 1000. BTMS-50 lotions are too powdery for me, but sometimes I want something drier than I could get with the oils/butters I've come to love and Olivem 1000.
I've tried a combination of BTMS-50 and Polawax and it worked out fine. A little thicker than I would have liked, but the emulsion was very stable. I realize this is only my anecdotal evidence, but I feel confident in saying that I think your emulsion would remain stable.
As well, though, you can use 8% of your emulsifier in the product and have it come out fine. I've tried the emulsifier - Polawax in one situation and Ritamulse SCG in another - as low as 5% and, although I didn't feel like it rinsed off as cleanly as I would have liked, it was satisfactory.