Mine were originally black gloss entirely. Since having the jacking points done, I have applied primer, black gloss and a layer of Schutz type underseal from about 2" down from the chrome strip (Masking tape applied horizontally and then undersealed using a scouring pad to give the stippled effect, then tape removed to give clean edge.). The stippled effect is then just about at the curved profile for protection but without spoiling the glossed sill effect.
