Until now, it could have been argued that two-coat systems would automatically provide better results than single-coat systems in ballast tanks. However, with conventional epoxy coatings - even two-coat systems - it is difficult to secure and ensure dry film thickness (DFT) on areas such as edges, welds, scallops, drain holes, behind angles and stiffeners, fittings, and in narrow and confined spaces. Two coats should, in theory, reduce the area covered with less than the specified thickness. Under the Performance Standard for Protective Coatings (PSPC), conventional epoxy coating systems must comprise two coatings. The standard does, however, include a provision that allows for systems with only a single coating, such as Nippon Paint's NOA 60HS, approved by CiassNK.
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