Hello
i used to go to Wendy's etc. and take a few of the Catchup cups home with me. Then purchased something like 5000 2 oz cups at Sams. Bathroom paper cups are 3 oz. I found some 3/4 oz or something like it also at a junk store.
I rarely mix up more than 3 or 4 oz of epoxy at a time.
our marine epoxy is a simple 2:1 mix. (sold in 12 oz and 1.5 gal units - the 1.5 gal kits are $72). Our other epoxies are 1:1 etc.
Ditto for the LPU polys (awlgrip clones) that we sell. They are 4:1 or
2:1 - again the tiny plastic or paper cups. I often just mix up enough to cover a 3 inch by 3 inch test panel.
hope this helps
paul