Here's a little tip on mixing epoxy or any two part glue. I go on my computer and draw different size circles two of the same size next to each other spread them out on the sheet so that you can cut them out into squares 3X3" or what you generally need. Then squeeze out to the circle part A on one and part B on the other, then mix, pretty darn close. I also print on some index or heaver paper. It works for me!
Wayne
I will have to try micro balloons for a mixer filler.