Looking for color by Hex, RGB, CMYK, or Lab?

Color Image

Actual color may vary from on-screen representation. Please view a physical color swatch or material sample to confirm your color choice prior to purchase.

Fast Shipping

70% of Orders Ship within 3 Business Days.

Ready to purchase? Select your options in the 4 steps below.

Step 1: Select Paint Type / Application

Spray, OEM, Bottles and Pens

House and Wall Paint

Epoxy, Urethane, and Colorant Concentrate


A match of Sherwin Williams SW9131 Cornwall Slate reads as a muted gray-green with a soft olive undertone and moderate depth. Its low chroma keeps it subdued rather than bright, and the color can shift a little warmer or cooler depending on lighting, sheen, and the surface under it.

MyPerfectColor custom spray paint matched to the selected brand color can be used on vents, switch covers, speaker grilles, railings, mailboxes, brackets, shelving, and small furniture parts where a quiet, coordinated finish is needed. It also works for PVC, hardware, shutters, and other removable components that need a consistent slate-green appearance.

Because this is a relatively dark, low-chroma color, surface prep and coating thickness still matter. Uneven substrates, texture, or a dark base color can change how the gray-green reads, and gloss level can make surface flaws more noticeable. On patchy or contrasting surfaces, additional coats may be needed for even coverage and a stable final color.

Similar colors:

HGSW3274 Marsh Grasses
HGSW3264 Hunter's Pointe
HGSW3244 Meadow Sage

Product Data

About Sherwin-Williams

The SHERWIN-WILLIAMS COMPANY was founded by Henry Sherwin and Edward Williams in 1866. Today, the company is a global leader in the development, manufacture and sale of coatings and related products.

Matching Sherwin-Williams Paint Colors

MyPerfectColor matches all of the Sherwin-Williams paint colors so you can find and enjoy the colors you love. MyPerfectColor uses its expert capabilities to recreate the original Sherwin-Williams color by matching the original Sherwin-Williams color books and swatches. MyPerfectColor is not using Sherwin-Williams paint.

The colors shown on this website are computer video simulations of the Sherwin-Williams Color and may not match Sherwin-Williams Color standards. Refer to Sherwin-Williams Publications to obtain the accurate color. Please know that MyPerfectColor is matching the original Sherwin-Williams color. If you intend to touch up paint that has been on your walls for years, know that your color has undoubtedly changed from the original due to exposure to light and age and the new paint may not match. You will achieve best results by re-coating the entire surface.

If you need more assistance, please feel free to contact us and one of our expert staff would be happy to help.

Frequently Asked Questions About Match of Sherwin Williams™ SW9131 Cornwall Slate *

Where can I find the SDS for SW9131 Cornwall Slate from MyPerfectColor?

The Safety Data Sheet is tied to the specific MyPerfectColor product and chemistry, not to the color name alone. For SW9131 Cornwall Slate, check the MyPerfectColor Safety Data Sheets page for the exact product format you plan to order, such as spray paint or another matched product type.

If you are comparing formats, review the SDS for the exact item you will use before you buy or apply it.

Can SW9131 Cornwall Slate be ordered as custom spray paint for switch covers, vents, and other small parts?

Yes. A match of Sherwin Williams SW9131 Cornwall Slate can be ordered as MyPerfectColor custom spray paint matched to the selected brand color for small parts and hardware where spray application is practical. Common uses include switch covers, vents, speaker grilles, brackets, trim pieces, knobs, and similar items.

For these projects, the main decision points are surface prep, primer compatibility, and making sure the part can be sprayed evenly without runs or heavy buildup.

How long does SW9131 Cornwall Slate spray paint take to dry, recoat, and fully cure?

MyPerfectColor custom spray paint matched to SW9131 Cornwall Slate is typically dry to the touch within minutes. Plan to recoat in about 1 to 2 hours, depending on application conditions, and allow about 2 weeks for full cure.

Dry to the touch, recoat time, and full handling strength are different stages. If you need to stack, assemble, or put the item into regular use, wait for full cure whenever possible.

What should I confirm before ordering SW9131 Cornwall Slate as a custom MyPerfectColor match?

Before ordering SW9131 Cornwall Slate, confirm the brand color reference, the MyPerfectColor product type you need, the sheen, and the quantity. Custom-made color matches should be chosen carefully because they are made to order.

If you are matching an existing painted item, remember that age, wear, substrate, and sheen can all change how the finished part reads. MyPerfectColor matches the selected color reference, not the exact look of an aged surface.

Which sheen should I choose for SW9131 Cornwall Slate in MyPerfectColor spray paint?

The best sheen for SW9131 Cornwall Slate depends on how the item will be used and how much reflection you want on the finished part. Sheen affects durability, cleanup, and how the matched color appears after spraying.

Lower-sheen finishes usually reduce reflection, while higher-sheen finishes can look brighter and may show surface texture more clearly. Choose the sheen that fits the object, the expected wear, and the finish level you want to maintain across the project.

How quickly will I receive my paint matched to Sherwin Williams SW9131 Cornwall Slate?
All paint is custom-made to order. While most orders ship within 48 hours, the lead-time for paint made to match Sherwin Williams SW9131 Cornwall Slate depends on the type of paint needed. Interior and exterior house paints usually ship within 1 to 3 business days, while custom spray paint typically takes 3-5 business days to ship. The transit time depends on your location and the shipping method you choose. If your need is immediate, select Expedited Production during checkout. Most expedited production orders ship within 24 hours on business days. Please contact MyPerfectColor if you are concerned about a specific deadline. We do our best to make sure you get your paint on time. Learn more about paint lead times at MyPerfectColor.
What are the RGB, HEX and LRV values for Sherwin Williams SW9131 Cornwall Slate?
The RGB values for Sherwin Williams SW9131 Cornwall Slate are 148, 148, 137 and the HEX code is #949489. The LRV for Sherwin Williams SW9131 Cornwall Slate is 29.27. The LRV stands for Light Reflectance Value and measures the percentage of light that a color reflects. Learn more about Light Reflectance Values and using RGB and Hex codes for paint.
What is the Hue Angle and Chroma for Sherwin Williams SW9131 Cornwall Slate?
The Hue Angle for Sherwin Williams SW9131 Cornwall Slate is 109.4 and the chroma is 6.38. The Hue Angle represents the position of a color's hue around a color wheel. The Chromacity represents the intensity of a hue. Learn more about browsing colors by hue.
Which paint matching the Sherwin Williams SW9131 Cornwall Slate would be best for interior walls?
MyPerfectColor doesn't sell Sherwin Williams, but it does match the Sherwin Williams SW9131 Cornwall Slate in a wide variety of paint types. The best paint for interior walls is typically a matte or eggshell. Flat paint is most often used for ceilings and semi-gloss paint is used for trim. If it is a commercial or industrial application, you may have other considerations such as chemical resistance. Custom spray paint can be used for in wall speakers, railings, HVAC vents, electrical cabinets and anything else needing a professional spray smooth finish. Contact MyPerfectColor support if you have specific questions about the best paint to use for your project.
How can MyPerfectColor match the Sherwin Williams SW9131 Cornwall Slate?

MyPerfectColor has an original sample of the Sherwin Williams SW9131 Cornwall Slate in its color archive. This enables us to make paint and verify that it matches the original.

Please note that if your material is not new then the paint may not work for touch up as your material has aged and is likely different than it was when new. Learn more about our color matching accuracy. If you need a touch up application, send us a part and we can create a touch up solution precisely matching the current color and sheen of your specific materials.

Learn more about our color matching service.

How much area will one spray can cover? And what is Sherwin Williams SW9131 Cornwall Slate spray paint made of?

To make spray paint matched to Sherwin Williams SW9131 Cornwall Slate. MyPerfectColor uses an acrylic enamel which is a fast-drying durable coating suitable for interior or exterior use. MyPerfectColor custom spray paint enables you to conveniently achieve a professional spray-smooth finish in any color in any sheen. It sticks well to most surfaces including metal, plastics, powder-coatings, cabinets and primed or previously painted wood.

The 11oz spray will cover about 20 square feet per coat. Keep in mind that it is difficult to gauge how much spray you'll need as it is highly dependent on how it is applied. It is better to have too much than run short.

How do I find the same color as the Sherwin Williams SW9131 Cornwall Slate in a different company?

While MyPerfectColor can provide paint matched to the Sherwin Williams SW9131 Cornwall Slate, we don't provide any crossover information because this is a subjective determination. Every paint company offers its own unique selection of colors and rarely does a color have an exact equivalent in another company's color collection, so determining which color is the best approximation is a judgement call.

However, under the color image on a color page there is a link that says "Explore Related Colors". Clicking this link displays colors with similar values and you can look for any colors from the company you want.

Keep in mind that this just shows similar colors based on the color values we have stored in our database. It doesn't mean it is the same or give any approximation about how close the color is. You can play around with the Hue, Lightness and Chroma sliders to expand the selection.