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Bought a can of the Duplicolor HiTemp Ceramic spraypaint in the Aluminum color (pic just shows red and black but there is an aluminum ). Actually used it to fix a spot on my old coated headers. For scratches, I just spray some into a small container (cap works fine), then apply it with a small brush, Q-tip, whatever is easiest. Works well and matches fairly closely.
Googled. DH1606 is the code. Check Autozone, Schucks, etc.