Weight is a major difference, but Sheetrock® Brand UltraLightweight All Purpose Joint Compound also has great workability, improved slip that makes it easy to wipe down and work with hand tools, very good wet tack that holds the tape in place securely so the finisher can run long strings of tape before coming back to wipe it in. The ultra light weight and wet tack also combine to keep the compound from dripping, thus reducing the time required to clean compound off the floors. Good open time is another benefit, enabling contractors to smooth a joint without the product drying prematurely and causing roll ups or tearing.