... specialty coating for metal structures
Because blasting is often not a part of the equation, a detailed assessment of the existing condition(s) is paramount in devising a surface preparation scope. Needle Guns, Grinders and other SSPC 3 Power Tools are often common recommendations for in prep of metal structures. It is important for the applicator to be familiar with the different types of metals and to make sure that the SSPC 3 Power Tools used will not further damage the metal surface being prepared (ferrous vs non-ferrous metals).
A second consideration is the existing coating system. The removal of existing coating system(s) is the best preparation option when considering a new coating system. However like blasting, the complete removal of existing coatings can be costly and in some cases not even feasible. Therefore, it is recommended a field test of the new coating system should be applied on the cleaned and prepped existing coating prior to commencing with the project.
Another factor is selecting the new coating system is the exposure to corrosive risk and the desired life cycle for the new coating. The higher the corrosive risk the shorter the potential life cycle of the coating. Coastal and offshore locations with high levels of salinity being the highest corrosive risk.
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