TapeTech QuickBox QSX 6.5" Finishing Box QuickBox QSX - is the first finishing box specifically designed to be used with fast-setting joint compounds (hot mud). Combine the speed of same day multi-coat hot mud with ATF flat box consistent finish! The 6 ½” QuickBox QSX is the perfect tool for drywallers who prefer to use fast-setting joint compound when embedding the joint tape. The QuickBox QSX works with paper tape, fiberglass tape or the new fiber joint tapes. The QuickBox QSX can be used for a wide variety of applications - Tape Embed, Nail Spot, Flex Trim Coating, Tight Area, Short Runs, and more. Constructed from advanced space age materials, fast-setting joint compound is easily removed from the finishing box, even hours or days later. The compound literally falls out of the QuickBox QSX with a few light taps.