Don't panic.

Brightside is designed to be put down and left alone, but judging by Marq and Aussie's results it can be polished with good results...

I'm just saying that if, after your final coat of Brightside, the surface is presentable, you could stop there. As others have noticed brightside dries with a nice gloss.

Most folks, however, have either not perfected their rolling to zero defects, or are perfectionists who can and do achieve better by working the finish.

Of course, some just enjoy the process. YMMV.

The best part is if for some reason you regret sanding your top coat, you can always whip out a roller and add another coat...