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Guys: This might seem far out, but during my electrolysis cleaning, I have noticed that the process does expose cracks that were mostly invisible prior to cleaning. It seems that the as the process converts the red rust to black oxide, the crack is the last to clean, so it tends to stand out. Also, from my old FPI (fluorescent penetrant inspection) testing days, the solvent evaporates last out of the crack, because the air can't get to it. If you moisten the surface, even with water, and watch it as it evaporates, you might just see a crack. Some perchlorethylene (non-flammable brake cleaning solvent A.K.A. old-timey dry-cleaning fluid) will penetrate, and will evaporate more slowly from the crack than from the surface. I've used all kinds of solvents, from gasoline to ther, to lacquer thinner to expose cracks, and have been sadly, pretty successful. I say sadly because finding the crack means a lot more expense. You can also try spritzing the suspected area with diesel fuel, then spray a light misting of lighter solvent on the surface. The heavier diesel fuel will again tend to stay in the crack, and under light as the solvent evaporates, be pretty visible. I've even used refridgereant...(when it was a tad more legal. It's all pretty cheap and easy to try ! And I like cheap and easy ! Frankin-Tallahassee
70D // 855
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