Denis, having them powdercoated in black does really well except when a person stands on the board and spins their shoe which puts circular scratches in the finish.
On my son's Model T truck, we powdercoated the boards in Black and then used a grey Scotchbrite pad to scuff them followed by using Black PPG Concept over the powdercoating. They have held up well over the past year or so against teenage kids jumping in and out, ...and you must look closer than a foot away to see any scratches in the surface.
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