A rod builder I know on the West Coast is marketing a very nice finish mixer. I and others have ordered it and am using it. It does a great job mixing the finish without all the bubbles. I use it for Aftcote and Flex Coat finishes. What I have learned is that using the mixer greatly extends the pot life of Flex Coat. That is a big plus.
I will email John and ask him to post the info here with pics.