Ultimate cove corner tool

A ultimate cove corner tool is provided for use in applying plaster material or a drywall taping compound to an inside corner joint between drywall panels to form a controlled and smoothly radiused surface. The tool includes a tool head in the form of a forwardly open resilient cup carried at a forward end of a tool handle, wherein the cup is adapted to support a quantity of the plaster or a drywall taping compound as the handle is manipulated to press and spread the plaster material or a drywall taping compound inside corner joint. The resilient cup deforms upon engagement with the drywall panels at the corner joint to spread the plaster material or a drywall taping compound material with a desired and smoothly radiused surface. The specific radiused geometry of the plaster material or a drywall taping compound surface in variably controlled by varying the orientation of and manual pressure applied to the resilient cup. At the end of the handle are threads which a person can screw a paint pole onto to give added length to the handle for reaching the higher inside corner joints between the drywall panels.