Due to transport damage or onsite cutting it may be that a coating is damaged or removed . It is important that the coating is repaired to ensure that the design life and appearance of the product is not compromised.
The galvanizing standard ISO 1461 provides several methods of repairing the Zinc coating up to a maximum area of 10cm2, which is around the size of a 50 pence piece. The easiest method is to apply several coats of Zinc in paste or paint form to the affected area. It is important that the area is dry and has been rubbed down with a wire brush before the coating is applied. Each layer should be allowed to dry before the next layer is applied. If the area is larger than 10cm2 the standard recommends that the steel is stripped and re-galvanized.
Powder coating can also be repaired using a similar method. The area should be cleaned with a panel wipe degreaser and allowed to dry. The area should then be lightly sanded in preparation for painting. The grade of sand paper should be 320-400 grit or finer. Paint can either be applied with a brush or aerosol, with the latter providing the best finish. The coats should be applied in thin layers to ensure that the paint does not run.
Highland is able to supply Zinc and paint from our facilities in Elgin and Cumbernauld. The aerosol paints for powder coating are colour matched by the powder supplier ensuring consistency in colour and gloss levels.