Correct KM.
Modern epoxies dont need etch (in fact they preffer not to have it as they are designed to stick to bare metal/alloy)
Resenes Industrial 440 is magic but does require top coating. If you go with a "standard" 2K finish from automotive sector you will save youself a heap of dramas.
Dont go to hard topcoats as they will chip too easily and are not easy to "touch up". This way, if you have any dramas in the future it can be fixed without beeing a major.
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