I refine hamburger fat. Takes multiple microwave heating and cooling cycles to remove the gelatin and water but it's worth it. I mean I'm cooking for my family and why waste the fat?
You can't leave anything that settles below the fat, it all has to be removed.
After that, I heat it one time to high heat to sterilize it then add to the usual ratio of paraffin wax and bees wax.
I've had it on bullets, in my Lyman 45 lube sizer and in jars both in my fridge and on my bench unrefrigerated for years and it's just fine.