Originally Posted by Roger Cole
Curl depends a great deal on ambient humidity so will vary with the weather.
And yes I mix my photo Flo with distilled water, at half strength and still get steaks if I don't gently wipe it. I get streaks even if I do wipe it if I mix full strength by the directions.
And what I do carefully, is watch the rivulets of Photo Flo in the white porcelain tray, until I see that Photo Flo has diffused sufficiently into the water, before letting the film in.