Galvanize Repair

Sean—Typically, we use galvanizing repair paint to recoat areas where the zinc surface of galvanized steel has been damage, removed, or weakened, exposing the ferrous substrate below. Since the repair paint protects the ferrous substrate from corrosion, it meets the Green Seal GC-03 definition of “Anti-Corrosive Paint” and must comply with the 250g/L VOC limit.

Jon, you mentioned that you use galvanizing repair paint to recoat areas where the zinc surface of galvanized steel has been damage. Do you know any specific product for this purpous that complies with the 250g/L VOC limit? Most of aerosol zinc coatings have >600g/L.

Rafal – For IEQc4.2, LEED NC-2009 cites GS-11-1993, GC-03-1997, and SCAQMD-1113-2004. Each of these standards exempts aerosol coatings, which SCAQMD defines as “pressurized coating product containing pigments or resins that dispenses product ingredients by means of a propellant, and is packaged in a disposable can for hand-held application, or for use in specialized equipment for ground marking and traffic marking applications.” Therefore, aerosols are not regulated by IEQc4.2. That said, aerosol paint applications can be highly volatile and difficult to control. Using these products on-site may add significant doses of VOC to the building, and should be avoided as much as possible. Control of these products should be addressed in the construction IAQ management plan for IEQc3.1 to avoid fouling the air quality tests for IEQc3.2.