How To Joint Compound A Wall. You paint the wall when you are finished. Joint compound (also known as drywall compound or mastic) is a white powder of primarily gypsum dust mixed with water to form a mud the consistency of cake frosting, which is used with paper or fiber joint tape to seal joints between sheets of drywall to create a seamless base for paint on interior walls.
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A wide variety of joint compound wall options are available to you, such as graphic design, 3d model design. Like any manual skill, feathering, or smoothing the outer edges of a joint, requires practice. Here's a video showing how to spackle a wall before you paint When smoothing joint compound already on the wall, keep the knife at around a 45 degree angle to the wall.