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White powdery deposit on welded areas of painted fuel tanks

I am conducting investigation on a ship fuel tank testing and repairs. A white powdery deposit is notable on the paint around the repair welds. It looks like the weld are done without cleaning up the paint and I am concern for the quality of the repairs. Is this white powder any sign to confirm my concern?

Violeta Gabrovska
Designer - Brisbane, QLD Australia
November 1, 2009

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