I've been painting around the house for the last 20 yrs and never had the problem so I like to think it's not my technique, but there again its my first time with his type of paint. Reading some reviews on the Zinseer suggest that the brushmarks are a common problem.
I'm repainting all the windows in my house white - inside only - they are currently a reddish brown woodstain.
I've completed the first room but I'm not happy with the finish. I used Zinseer Coverstain to ensure that the woodstain would never bleed through, and then Zinseer Permawhite...