Rusted Surfaces Should Be Wire Brushed Down Removing All Loose Material Until A Bright Steel Finish Is Obtained. If Applying To New Untreated Galvanized Iron; The Surface Should Be Treated With An Acid Degreasing Primer Until A Water Break-Free Surface Is Attained And Allow To Dry. Coverage 7 8M2 Per Litre Per Coat. For Best Results Always Apply Two Coats (2-3 Hours Between Coats)