Yea,
I feel pretty good about the numbers, that 500ml can process 4 8x10 sheets, my concern is using that same 500ml twice.
ie I'm not splitting the 500ml into two 250ml batches and using each of those on 2 8x10 sheets but rather using the whole 500ml on 2 8x10 sheets then the next day using that same 500ml on another 2 8x10 sheets. I'm worried if there is any problems with cross-pollution, seems like there shouldn't be since there will be cross-pollution w/in the tank anyway on the 1st run...