Weighs 25 percent less than conventional setting-type compounds. for patching applications on interior gypsum panels and exterior gypsum ceiling boards. vinyl binder, nonasbestos, safe to handle, sand, use. sanding ease similar to a ready-mixed, all-purpose joint compound. offers humidity resistance, exceptional bond with low shrinkage, and check-crack resistance in heavy fills. permits same-day joint finishing, and, usually, next-day decoration. meet astm standard c475.