As well as offering a strong and durable finish a multi coat system can also offer colour co-ordination, for example chevroned safety zones, hand railing, or fluorescent high-viz coatings.
Multi coat systems are generally used to ensure the chosen coating system is suitable for the steel works intended end use, it is generally chosen by category (C1 to C5) and expected durability from under 5 to over 15 years to first major maintenance.
C1 Heated buildings/neutral atmosphere
C2 Rural areas, low pollution
C3 Urban and industrial atmospheres, Moderate sulphur dioxide levels & Production areas with high humidity
C4 Industrial and coastal,Chemical processing plants
C5I Industrial areas with high humidity and aggressive atmospheres
C5M Marine, offshore*, estuaries, coastal areas with high salinity
High Durability >15 years to first major maintenance
Medium Durability 5-15 years to first major maintenance
Low Durability <5 years to first major maintenance
(BS EN ISO 9001:2008)