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Weld crack kit and fault finder system is specially formulated for weld seam quality assurance. The product comes in the form, of a 'Developer' and a 'Penetrant'. Weld penetrant is formulated to seep into any micro cracks present in a weld seam. This product is also referred to Dye Penetrant Inspection (DPI) or liquid Penetrant Inspection (lPI); it is as an inspection method to locate surface-breaking defects in all non-porous materials including plastics, ceramics and most metals. Weld developer consists of a white powder suspended in solvents; this product is designed to pull the entrapped penetrant to the surface by capillary action.