Buy some real tack cloths to do this job. A little sawdust left behind will ruin all your hard work. The surface has to be very clean including all the crevices. Also, the paint they are using in this video is a Behr paint which you can get at Home Depot.
How To Cut In Paint Like A Pro
I see many people who have never learned to do this. But you don’t have to be one of those anymore. Here’s a quick free lesson.
Kevin Hicks 