Knockdown, a drywall texturing technique, is not very challenging and the results are reasonably predictable yet visually interesting. The usual method for applying the texture on ceilings is to spray it on with a hopper gun. You then scover the spray with a drywall knife to “knock it down” and .How to Paint Knock Down Textured Walls. Knock down textured walls are quickly becoming a popular means to decorate the walls of a room. Once a person finishes the knock down texturing, he or she will need to paint these walls..Achieve the look of a custom crafted three dimensional, grid ceiling at a practical price with WoodTrac ceiling system..We Specialize in the following areas No mess popcorn ceiling removal Re spray popcorn ceilings Smooth texture to ceilings walls Knock down texture to ceilings walls.