A commercial estate manager called us in to assess a tired aluminium curtain-wall system on a central London frontage. The powder coat had chalked through, sills were biological-staining and the glazing-edge gaskets had run with run-off. Replacement would have meant scaffolding the unit closed for the better part of a month.
We surveyed frame by frame, identified the substrate as restorable (gloss-meter readings + cross-hatch adhesion test passed), specified a two-pack tie-coat over light abrasion, and applied a matched RAL anthracite topcoat at 60-80 µm dry film. No glazing was removed. Restoration was delivered live around the ground-floor retail trade.
Total cover: approximately 320 m² of curtain-wall frame and sills, restored over a three-week shift pattern. Adjacent glazing, ironmongery and signage were masked through to demask. Service-life expectation issued in writing on handover: 5-7 years on the substrate as surveyed.