I apologize in advance if this has already been brought up (and believe me I searched!) but I just redid my master bathroom. I put in new green drywall, primed it twice and put on a first coat (using a roller) of enamle semigloss. It came out nice, but definitely needed a second coat.

Since the room is small, I decided to brush on a second coat. I definitely didn't think I was putting the paint on heavy, and I used long brush strokes to even it out. Initially it looked fine, but as it started to dry, it appeared to "run". Not just drip, but whole areas seem to run. I tried to briush it out, but today I still noticed areas that seemed to run.

2 questions:

1) what caused this?

2) what would be the best way to correct this now?

Thanks for any responses!