Deck Stain Showdown: Water-Based vs. Semi-Transparent... Light Walnut Tested? We've tested the #1 Deck Premium Semi-Transparent Outdoor Wood Stain and Sealer in One-water based, Light Walnut-and it's worth the attention. While it's designed as a semi-transparent formula, its water-based base makes it low-odor and eco-friendly, a plus for sensitive users. Applying it was a breeze, with even coverage across our weathered cedar deck and pine fence. The Light Walnut hue added a warm, natural amber tone without leaning into dark stains, preserving the wood's grain while offering robust protection against moisture and UV damage. We noticed it dried quickly, resisted peeling, and blended seamlessly with existing finishes. Though it's not as opaque as some traditional options, it maintained rich color depth over weeks of rain and sun. For those seeking a balance of aesthetics and durability, this product delivers-though we'd recommend testing on a small area first to ensure the shade aligns with your vision. A solid choice for eco-conscious DIYers.