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Do a websearch for "magnaflux", then locate a local distributor. Most times if you are polite, etc. they might give you a 'sample' set. WorstMarine can special order; sometimes appears in the WM catalogue as 'dye penetrant'.
When looking for fatigue cracking, look for areas of dullness that look like 'fans' or a zone of dullness. Also especially look at any notches or areas of surface irregularities .... saw marks, mill scale, etc. Any area or surface that has changed 'texture' is suspect for fatigue, such zones may not show up with dye penetrant.
Polishing to a 'mirror' surface retards the fatigue process. But .... lets face it, most 'boat designers' design chainplates to 'tensile' values and NOT endurance/fatigue values; hence, the propensity of fatigued chainplates.
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