Gateway Gray vs Sea Mariner

Gateway Gray and Sea Mariner come from the same Sherwin-Williams collection. Gateway Gray reads as greige-grey, while Sea Mariner reads as blue-grey — two distinct hue families, not close cousins. The 35-point LRV gap — 41 for Gateway Gray vs 7 for Sea Mariner — means Gateway Gray will open up a space more effectively. Where Gateway Gray leans warm, Sea Mariner reads cool — a distinction that shifts noticeably depending on the light source and surrounding finishes. A ΔE of 42.3 puts these firmly in different territory — two distinct design choices rather than close alternatives. Below, 5 simulated room previews show how each color reads at scale — real-room photos will be added as they become available.