USG Sheetrock Brand Durabond Joint Compounds let you set the pace with a range of formulations that provide a choice in setting times. They provide low shrinkage and superior bond, which make them excellent for projects like laminating gypsum panels to gypsum panels, sound-deadening boards and above-grade concrete surfaces.
Plaster of Paris, Limestone, or Dolomite, Expanded Perlite, Mica, Vinyl Alcohol Polymer , Attapulgite, Crystalline Silica
Position and apply Sheetrock gypsum panels according to manufacturer’s recommendations. Mix Durabond joint compound according to directions on bag. If using Sheetrock gypsum panels, SW edge, prefill the “V” grooves formed by abutting edges with Durabond 45 or 90 joint compound. Apply compound directly over “V” groove with a flexible 5 or 6 joint finishing knife. Wipe off excess compound applied beyond the groove. Allow the prefill compound to harden prior to the next application. Cover joint with a thin layer of compound and embed fiberglass or paper joint tape, leaving about 1/32 of compound under feathered edge and a thin layer over the tape. After compound has set, apply second coat, feathering out approximately 2 beyond first coat. After setting, apply third coat, feathering out 2 beyond second coat. After each coat is applied, smooth away any tool lap marks or other imperfections prior to setting action. Finish fastener heads with three coats of joint compound; finish corner bead and inside corners as required with at least two coats, feathered and smoothed out onto panel faces.
Durabond setting-type joint compounds can be used for filling, smoothing and finishing interior concrete ceilings and above-grade concrete. Other uses include finishing joints in exterior gypsum ceiling boards and presetting joints in veneer plaster finis