Sherwin Williams Sea Mariner SW 9640 paint color review

Let’s dive into a full Sea Mariner paint color review. Take a look at pictures of real interiors and exteriors painted with beautiful SW 9640. Find out if this gorgeous cold blue paint color would look great on your living room walls or trims, kitchen cabinet, bedroom accent wall, bathroom or house exterior.

Color code:SW 9640
Color name:Sea Mariner
Brand:Sherwin Williams
Color collections:Emerald Designer Edition - Rustic + Refined

Sherwin Williams Sea Mariner reviews

  • Sea Mariner Utility Room
    Instagram @patti_wilson_design
  • Sw Sea Mariner Painted Cabinets
    Instagram @patti_wilson_design
  • Sea Mariner Painted Cabinets
    Instagram @dutchhausfurniture
  • Sherwin Williams Sea Mariner Laundry Room
    Instagram @dutchhausfurniture

View the photos of real spaces painted with this that were not included in specific categories.Close-ups, painted furniture, storages and dressers, hallways, stairs and ceilings.

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What are Sherwin Williams Sea Mariner undertones?

Blue is Sherwin Williams Sea Mariner undertone color, as you can clearly see on the color field below. To determine this undertone we’ve removed all the tints, tones, shades and get HUE (pure color). Seems that undertone definition on a white sheet is already outdated and rather inaccurate


HEX value

HEX value:


RGB code:

67, 74, 84

Is Sherwin Williams Sea Mariner SW 9640 cool or warm?

warm colors
Color wheel
cool colors

With a hue of 215° this Blue refers cool paint shade according to HSL (Hue, Saturation, Lightness) on the color wheel.

SW 9640 Sea Mariner HSL code: 215, 11%, 30%

Hue - degree on a color wheel from 0 to 360. 0 is red, 120 is green, and 240 is blue.
Saturation is a percentage value. 0% is a shade of grey, and 100% is the full color.
Lightness is also a percentage value. 0% is black, and 100% is white.

  • Cool Blue shades make a room feel sleek, fresh and modern
  • Cooler hues have a calm and relaxation effect
  • Cool Blue undertones make small spaces feel more open and expansive
  • Cool paint hue are ideal for bedroom or bathroom. Be careful with deep blues and greens in bathroom, which will reflect on your skin.

Act like a pro: Mixing warm and cool shades is a must have to get harmonius interior. Add accents that contrast with the primary color to create visual balance. If your walls are a warm color, don’t forget to add accent in cold colors (furniture, art, décor). A good practice is too use a complementary color scheme.

Coordinating colors.
Colors that go with Sherwin Williams Sea Mariner:

Monochromatic color scheme

Monochromatic color scheme

This scheme consists of different shades, tints, and tones of a single color. It's the perfect hue combination, but with no accent decor it's pretty boring.

Lighter shades

Sherwin Williams SW 9640 Sea Mariner

Darker shades

Complementary color scheme

Complementary color scheme

This color scheme is a combination of two colors that are opposite each other on the color wheel. The high contrast between these colors creates a vibrant and dynamic visual effect.

Color comparison

Sea Mariner SW 9640 vs Big Dipper SW 9645

Choosing the best shade for your space? We've compared the two colors to help you make an informed decision for your project.

Sherwin Williams Sea Mariner SW 9640 vs Sherwin Williams Big Dipper SW 9645Open Sea Mariner SW 9640
LRV: 6.68%
Dark color
Temperature: cold
LRV: 6.4%
Dark color
Temperature: cold

Sea Mariner SW 9640 vs Quixotic Plum SW 6265

We'll help you determine which of these shades will work best in your space.

Sherwin Williams Sea Mariner SW 9640 vs Sherwin Williams Quixotic Plum SW 6265Open Sea Mariner SW 9640
LRV: 6.68%
Dark color
Temperature: cold
LRV: 6.47%
Dark color
Temperature: cold

LRV of Sea Mariner

Sea Mariner SW 9640 has an LRV of 6.68% and refers to Dark colors which means that this color almost does not reflect light

Color paint LRV values

Light Reflectance Value measures the amount of visible and usable light that reflects from a painted surface.
Simply put, the higher LRV of paint color, the brighter room you will get.
Scale goes from 0% (absolute black, absorbing all light) to 100% (pure white, reflecting 100% of all light).

Act like a pro: Choosing paint with LRV of 6.68% be attentive to your bulbs light Brightness.Light Brightness – measured in lumens. The lower LRV of paint you have, the higher lumen level you need. Every square feet of room needs at least 40 lumens. That means for a 200 square feet living room you’ll need 8000 lumens of light. To achieve that brightness, you would require a total of 8 bulbs, 1000lm each.

Color codes

We have collected almost every possible color code you could ever need. To copy the code, just click the icon to the right of it.

HEX#434a54copy color code
RGB Decimal67, 74, 84copy color code
RGB Percent26.27%, 29.02%, 32.94%copy color code
HSVHue: 215° Saturation: 20.24% Value: 32.94%copy color code
HSLhsl(215, 11, 30)copy color code
CMYKCyan: 20.24 Magenta: 11.9 Yellow: 0.0 Key: 67.06copy color code
YIQY: 73.047 I: -7.385 Q: 1.631copy color code
XYZX: 6.363 Y: 6.731 Z: 9.349copy color code
CIE LabL:31.186 a:-0.363 b:-6.878copy color code
CIE LuvL:31.186 u:-3.98 v:-8.453copy color code
Decimal4409940copy color code
Hunter lab25.944, -1.621, -3.205copy color code
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