Basically, drywall tape is an extremely handy way to hide joints and seams between your drywall panels, leaving you with a smooth, perfect finish to your walls. Drywall tape comes in a roller which you can either apply to your joints manually or using an automated tape gun.
Apply a coat of drywall compound either on the joints or in an area under the tape in the spaces between cuts, making sure that it is a little wider than the tape width. You will want to apply two or more additional coats, fanning out each one slightly more, until your drywall tape is completely covered, and your drywall compound is nearly completely smooth. As you work, either spread excess compound thinly on top of the drywall tape, or clean it off with a drywall knife, then use brand-new compound gently to coat over the tape. Run the knife across each side of the majority of paper drywall tape to press it down in the compound (or use the edge knife with two sides to deal with both sides at the same time).
Ready-mixed joint compound is most commonly used in hanging drywall for new or remodeled homes. Application is simple and easy, rarely taking more than three or four coats. When used for new walls, joint compound effectively eliminates all blemishes from the surface of the drywall, such as fasteners, damage, or drywall tape. Joint compound is used to finish gypsum panel joints, corner bead, trim and fasteners, as well as skim coating. In addition, it is also very handy for fixing minor blemishes or damages to walls. It easily patches up holes, bumps, tears, and other minor damage.
Joint compound is a white powder of primarily gypsum dust mixed with water to form a paste 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 and ceilings.
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