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Preheat the parts to about 100 - 120º with a propane torch before spraying the red dye. The dye seeps into the cracks as it cools.
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Soo, ya have to take the chain plates of the boat to do the testing...?
The removal is usually the hardest part of the process, so ya might as well replace the plates if ya already got 'em out.
Replacing chain plates is part of normal sailboat maintenance anyway and should be done every 15 to 20 years as crevise corrosion in SS can be a silent killer.
To put my money where the mouth is, I replaced all 9 plates on my ship 2 years ago.
It was a bitch of a job, but the actuall expenses for having new plates made was not that great: $750.00 for all 9 plates pluss 3 backing plates, all 316 SS.
Also had 'em electro polished for another $120.00 or so,
All new shacles, pins, bolts, washers, nuts, caulking and misc came to another $300 or $400.
But the labor removing and re-installing was especially tasking.
Perhaps one of the disadvantages of the CSY 33: The chain plates are built in, and there is tight spaces..
Fortunately, it is a long time to the next round...
