i never understood using a tuna fish can for mixing glue, tuna fish cans are small and has too many places where unmixed parts can hide... I have had good luck mixing the 2 parts on red plastic plate from The Grocery store with a bondo spreader cut in half. I know some guys use wood scraps to mix epoxy, I did on my first glass bow and I have a tiny piece of red elm under the clear glass, I assume it came off the red elm cut off I mixed the smooth on with. I mix the glue then use the second half of the bondo spreader to apply epoxy, toss everything in the trash when done..