Why does my corner finisher leave edges?

TapeTech corner finishers are factory calibrated to feather both edges of the inside corner joint at the same time. If your corner finisher is leaving edges on one side of the corner, be sure to apply equal pressure to both sides of the corner finisher by keeping the tool and the handle centered in the corner. If the edges are occurring on both sides of the inside corner joint, the blades of the corner finisher are most likely worn. We recommend you have the blades replaced and calibrated by an Authorized TapeTech Repair Center. The nearest location can be found here on the website.