Hotrolled metal prep

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    I have a 1971 jeepster that I have built a new floor pan for out of 18 ga. hot rolled steel. Do I need to sandblast the surface to get rid of the mill scale before coating the underside? If I use epoxy primer or rust encapsulator as a firt coat, do I need to paint or topcoat it before applying a product like HD Antirust? Thank you for any advice.

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