USG Durabond #90 25LB. Bag

For interior gypsum panels and exterior gypsum ceiling boards

Unique humidity resistance

Exceptional bond, low shrinkage

Unusual check-crack resistance in heavy fills

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