Fabricator here. You are right- red scotchbrite pad on a linear (pneumatic stroke) sander or handheld pad or scotchbrite belt on a belt sander. Use a length of wood as a fence to keep your strokes parallel. This garbage cladding is super thin so you are right to warn of burning it so if using a flap wheel, keep it moving. These Scratches are about as shallow as this #4 brushed finish and there’s no need to knock it down with 60 grit (which is far too coarse unless starting with a casting)