The Use of Multiple Layers
In some cases it is advised to coat your object with multiple layers.
Although in these fast-paced times of doing business, time is key, there are cases in which we advise to work with a multiple coating layer system as the effect and durability will outscore the initial economic decision in the long run.
Higher layer thickness
In order to protect your object from UV influences, using a second layer clear topcoat can help. Applying a thicker coating also takes aggressive elements away from the metal surface. In extremely aggressive environments, such as industrial and marine environments, multiple layers give better protection against filiform corrosion.
Protection of coatings with metallic pigments
Some metallic pigments in powder coatings are sensitive to discolouring caused by external influences of pollution in the atmosphere, moisture, sand and guano. Without a topcoat the metallic pigments would oxidize. Objects, such as a chair or handrail, intensively exposed to abrasion and/or humidity, are better protected by a supplementary transparent powder coating.
Better corrosion protection
In order for a metal substrate to optimally resist corrosion, a two-coat system can be applied.
Better edge covering
Whereas a first layer does not give sufficient protection at the edges (especially at sharp edges), a second coating will provide an extra protective layer.
Alternative for metallization
On steel objects, shot blasted at SA 2½, a first layer (40-50µm) of zinc rich powder primer can be applied. This primer is an alternative for a metallization pre-treatment (a polyester finishing coating can be combined with this primer).
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