Deck Stains & Sealers

Brown Treated Wood from Northern Crossarm is the rich, prefinished lumber product you’ve been waiting for.

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The Nation’s #1 Brown Treated Wood Supplier

Northern KDAT Deck Sealer

Northern KDAT Deck Sealer is a durable wood finish that helps protect against the damaging effects of water, fungi and UV radiation on all types of wood surfaces including cedar, redwood, pressure-treated and composite lumber. V.O.C. compliant, this water-based sealer delivers a beautiful matte finish, fortified with transparent oxide-based nano particles. There are over 30 trillion nano particles per square inch that provide extreme, all-weather protection.

Northern KDAT Deck Sealer Features & Benefits

The Nation’s #1 Brown Treated Wood Supplier

Northern Crossarm brown color mix

NEW for 2022! An exact-match brown formula to refresh Brown KDAT lumber or decking. Also used for end-cuts. Simply mix the 4-oz. container to 1 gallon of Northern KDAT Deck Sealer (Clear).

Northern crossarm brown color mix Features & Benefits

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Looking for your nearest KDAT lumber dealer? We have stocking yards throughout the United States.

“I refinished my deck with northern crossarm’s deck sealer, and not only was it fast and easy to apply, but the end result brought my grayed out deck back to life.”

Brett Hansen, Homeowner, Eau Claire, WI.

Deck Sealers & Stains Photo Gallery

Deck Sealer FAQ & Information

Brown Treated Wood FAQ

How To Apply Northern KDAT Deck Sealer

Watch this short, 2-minute clip before sealing your deck with Northern KDAT Deck Sealer.

We recommend applying Northern KDAT Deck Sealer on your deck within 2 weeks after installation! To minimize warps, cups, and the quality of your deck, it’s of paramount importance to protect it immediately with our Northern KDAT Deck Sealer.

No. The Brown Color Mix is used if/when you need to refresh your brown-finished deck. With a quality sealer, it can take years before you need to add our color mix. However, you can and should you our brown color mix on all deck board end cuts for an exact-match finish, and it can be applied directly after install.

The video on this page has clear instructions of how to apply Northern KDAT Deck Sealer. We recommend a brushed application with a car brush. This ensures a fast, even coating. Apply within two weeks after install. Dries very fast.

Brown Treated Wood Resources

FREE 37-Page KDAT Lumber Guide

The Ultimate Guide to KDAT Lumber

Kiln Dried After Treatment (KDAT) wood is pressure treated lumber that’s been dried after the pressure treating process to deliver better resistance against warps, cups, twist and checks.

Brown Treated Wood Articles

90-Day Stocking Dealer Program

Try our top-selling KDAT for 90 days, risk free – if it doesn’t sell, we’ll pay to ship it back!