Steel - The surface should be blast cleaned to SSPC-SP 10-63T or NACE No. 2 i.e. loose rust and scales, dirt, grease, oil, paint, wax, weak oxide films and other contaminants should be removed. Blast cleaning to SSPC-SP 5-63 or NACE No. 1 is recommended where heavy corrosive conditions exist or coating is required to be immersed. That means a surface with a grey metallic colour, slightly roughened to form a suitable anchor pattern for coatings. This surface is free of all oil, grease, dirt, mill scale, rust, corrosion products, oxides, paint and other foreign matter. Hand or power tool cleaning is not effective. Remove all the contaminants. Apply one coat of Anuzinc 235 EP. It can be over-coated with Durapoxy 200 Epoxy Enamel, Anuthane Enamel Polyurethane or Monocoat Enamel Polyurethane and Anuchlor 555 LB Chlorinated Rubber Enamel.
Priming:
It is recommended that priming should be carried out within 4 hours if inside a building, but if exposed to weather, the steel must be coated immediately after blasting. Should it become necessary to leave cleaned surfaces unpainted overnight, such surfaces must be re-cleaned before painting. Paint only on dry surfaces. Do not paint exterior surfaces in damp weather or when the temperature is less than 10° C. The dry film thickness (DFT) should not be less than the DFT specified. It is recommended that one coat of Anuzinc 235 EP at 25 microns minimum DFT should be applied on shot blasted steel whereas one coat at 50 microns DFT is required for grit blasted steel for best protection. More coats can be applied as per requirements.
Over-coating:
In common with epoxy coatings generally, over-coating should be carried out within 24-48 hours or left for 7 days when the coating has cured completely. However, Anuzinc 235 EP can be over-coated after 16 hours. Care must be taken while over-coating the primed surface. Oil, grease, dirt etc. should be removed by degreasing the surface with degreasing solvents like tri-chloroethylene or xylene and subsequently washed off with fresh water. The surface should be allowed to dry before painting. |
