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I have been trying to brush on Sherwin Williams Waterbased Polyurethane (satin)with little success. It just won't flow out very much and I am left with brush marks in the surface. I've tried a few different applicators and brushes and the results are basically the same.
If this was oil based poly I would just thin it as needed but the guy at Sherwin Williams says that they don't recommend thinning it. I asked him about Floetrol but he didn't know enough to comment beyond saying that the data sheet he had didn't mention that you could add it.
I don't have any Floetrol so I am reluctant to buy some just to perform a test that may not work. I thought I would rather rely on someone else's experience if possible. I tried adding about 10% water . The flowout was marginally better but the sheen was spotty when it dried.