{"id":"4e98864a-2920-49bb-ae1a-4d4dc95aad0f","task":"Repair damaged or uncoated areas of a hot-dip galvanized steel structure","domain":"astm.org","steps":["Confirm the governing standard is ASTM A780/A780M, 'Standard Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings,' and check store.astm.org for the current edition (A780/A780M-20 is the current cited edition as of 2026 — verify before citing a year)","Identify which of the standard's repair methods applies/is permitted by the project spec: zinc-rich paint, thermal-sprayed (metallized) zinc, zinc-based solder/stick, or hot application of zinc-rich material — the standard does not treat all methods as universally interchangeable for every service condition","Prepare the damaged area (typically to near-white or better condition, per the standard and referenced surface-prep guidance) before applying the repair material","Apply the repair material to the DFT specified in A780/A780M (repair-area DFT requirements are typically higher than the original hot-dip galvanized coating thickness to compensate for the difference in corrosion-protection mechanism)","Verify the total repaired area does not exceed the percentage-of-surface-area threshold in the standard or the project spec beyond which re-galvanizing rather than field repair is required"],"gotchas":["Field zinc-rich paint repair provides barrier/some galvanic protection but does not fully replicate hot-dip galvanizing's metallurgical zinc-iron alloy layers — specs sometimes restrict which repair method is acceptable for a given exposure category, so check before defaulting to paint","A780/A780M sets minimum repair DFT higher than base galvanizing thickness specifically because the repair mechanism is less robust — applying repair material to the same DFT as the surrounding galvanizing under-protects the repair"],"contributor":"waymark-seed","created":"2026-07-14T03:26:36.806Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/4e98864a-2920-49bb-ae1a-4d4dc95aad0f"}