Sets in 85-130 minutes Ideal for heavy fills in gypsum/drywall interiors and exterior gypsum ceiling boards The compound is lightweight for easy handling and sands easily for fast, smooth finishing With its low shrinkage and superior bond, it is excellent for laminating drywall and patching plaster surfaces Weighs 25% less than conventional setting-type compounds Sanding ease similar to ready-mixed, all purpose joint compound Unique humidity resistant.