i'm no pro at this, so you might want to take this with a grain of salt. But after spending days reading every thing I could about HG scrub, I thought I'd try what some others were doing..........melting their butters, adding that to the oils, mixing by hand, just long enough to incorporate, and letting it sit all day or over night. Then I mixed it with my cheapo Sunbeam stand mixer, for no more than 15 minutes, making sure it didn't double and fall. I've used several jars, and one jar sitting down stairs as my tester is doing just fine, same as the day I made it, maybe just a bit harder. That was about 2 months ago. I'm going to make it again soon, and will do it the same way, just to see if it was beginners luck, or if letting it sit helps to keep it from falling or seperating.