Patent ID: 7992316

Claim:
A system for locating the midpoint of an arc of a bull-nose while masking surfaces adjacent to the bull-nose corner between a pair of flat walls, the system includes: a flexible planar sheet of material that is made from an upper layer and a peel-away lower layer, the upper layer having an upper layer upper surface and an upper layer lower surface, the upper layer lower surface having a low-tack adhesive is protected by the lower layer that covers the lower surface of the upper layer; the flexible planar sheet having a plurality of shapes scored through the upper layer but not through the lower layer, each shape having a perimeter that encloses the entire shape, the perimeter including at least one semicircular edge creating a concave arc into the shape, the semicircular edge commencing tangentially from a straight edge in the upper layer, so that when the arc of the shape is positioned against the bull-nose while the straight edge portion the shape is positioned against one of the planar walls the lower surface is adhered to the surface adjacent to the bull-nose; and a hand tool comprising a tool arc that is concave and a tool straight edge that is tangential to the tool arc, so that the hand tool cooperates with the shapes to locate the midpoint of the arc and the straight edge of the left handed shape to produce an overlapping area, thereby focusing the location of the midpoint of the bull-nose to the overlapping area.