| Chain plates
I would think that if there were any cracks they would be around the bolts or clevis eye.
You don't have to heat the parts, but it does work better that way. Just have to let it sit for a while to soak into the cracks before cleaning it off for the develpoer.
You can tape off around the plates to keep the dye from soaking in the paint or gelcoat. But you will not be able to see the back side and that's where you'll find the first cracks, most likely from the bolts pushing in on the plates.
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