RE: Tests for crankshaft coating?
Not too sure about testing methods but can help to put your mind at rest regarding the application.
This application has been carried out for at least 3 decades, if not longer. It has been used on everything from motorbike engines through to large commercial diesel engines. Although less common in many parts of the world now as it is often cheaper to buy new (particularly for cars/van etc), it is still widely used in less developed countries and when new replacement parts are not easily available (old tractors / trucks etc.).
In my opinion, if you stick to the tried and tested procedure, you should not experience issues. The correct procedure will include a rough cut, degrease, grit blast, bond coat and then top coat. When you try to cut corners by missing out a process (blasting is commonly not done or people will skip the bond coat) then you are POSSIBLY going to get problems.
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