The existing drywall “should be free from any cracks ... For example, dab with a sponge or brush, use a special swirl brush or roller, or use a notched trowel to create ridges or lines.

“Knockdown and orange peel are manageable for beginners; skip trowel and sand swirl demand ... and a brush or sponge to cut into corners. SUPPLIES Also known as drywall mud, joint compound ...