I too found that my Part A was getting thicker as it was slowly being used up. There was usually a little goop on the bottom of the can, but I always mixed the paint well using a stir stick that has holes in it making sure to drag it along the bottom of the can for a thorough mixing prior to using ladles to measure the amount of primer desired.
For the second batch of Akzo purchased, decided to experiment a little and try to create an oxygen barrier to hopefully mitigate the thickening. I experimented by only kept the cans open just long enough for a good fast mixing, ladled the amount of primer desired, then immediately placed the top on the can. When the paint session was over, I sprayed lots of wine preservative into the Part A can ... with the idea that the inert gas would create a barrier to help keep oxygen away from the primer. Using the wine preservative really seems to help prevent the Part A from becoming extremely thick as more is used from the can. I think it really helped out quite a bit compared to the first can I went through ... the second can got a little thicker as time went on, but nowhere near as thick as the first can became.
As a side note, I also used the wine preserver with Sherwin-Williams water reducible JetFlex paint with great success.
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John
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