The carbon-fibre strip: 50 × 1.2 mm, paid off the reel and pressed onto the surfaceTool head on its wrist: grinder, epoxy die, spring-loaded rollerA mast robot strengthening a parking-garage bay with externally bonded carbon-fibre (CFRP) strips on the floor, the wall and the ceiling. The tools ride on one head at the end of a boom. A two-stage mast lifts it from the floor to the soffit 2.2 m up, and a wrist turns it to face the floor, the wall or the ceiling. The robot backs the head off the surface while it moves. The cup grinder at the front takes the laitance off a 100 mm lane. Behind it the reel pays out a 50 × 1.2 mm laminate (E = 165 GPa, 2,800 MPa, so 168 kN to break it) through a die that butters it with a non-sag two-part epoxy, about 0.26 kg per metre. The roller's springs press the strip on until epoxy squeezes out along both edges. The paste is stiff enough that the strip stays on the ceiling until it cures. The reel holds 15 m on a 120 mm core (outer radius 9.7 cm), which bends the strip to 1.0 % strain, under its 1.7 % rupture strain. The outrigger jacks go down whenever the mast is up.