High quality, 100% acrylic paint can give a service life of up to 10 years when applied to specification on correctly prepared metal surfaces. This lifespan will vary slightly with colour, roof orientation and the aesthetic requirements of the situation, but poor paint curing will downgrade durability.

Paint should not be applied on wet days, when condensation has not completely dried, on cold days below 10° or hot days above 30°. Windy days are also not suitable, as curing is impaired.

The painting of very hot roofs will result in the evaporation of the solvent before full film formation can take place, and so will reduce the life of the coating.

Ridge ladders should be fitted with protective buffers or rubber pads as they can cause extensive abrasion damage to pre-coated metal cladding. Where it is possible the painter should walk in the pan, but when it is necessary to step on the rib, attention should be paid to sheet overlaps as these may spring up after a painter's weight is removed and reveal an unpainted line.

Decking profiles have a tight roll-formed bend at the top of the upstand and care is necessary to ensure the specified film build is applied in this area.


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