10 Best Clear Deck Sealers 2025 in the United States

The Ready Seal 512 is an oil-based wood stain and sealer that offers several notable advantages. Its ease of application stands out, as it can be applied using a sprayer, roller, or brush and does not require a primer, back brushing, or wet-line application. The 'Goof Proof' application ensures no laps, runs, or streaks, making it user-friendly even for those with minimal painting experience. Additionally, it can be applied at any temperature, providing flexibility for various weather conditions.

The product also includes UV protection, enhancing the longevity of the wood by preventing sun damage. Its natural cedar color reaches its true shade approximately 14 days after application, offering a visually appealing finish once settled. However, it should not be applied over painted or newly stained surfaces, as sealed surfaces inhibit penetration, which might be restrictive if you're looking to refresh previously treated wood.

The ease of use and the aesthetic finish make Ready Seal 512 an excellent choice for homeowners seeking a straightforward and effective wood stain and sealer, particularly in terms of application and visual results.

The Seal-Once Marine Premium Wood Sealer stands out for its comprehensive protection features. It provides robust UV protection, which is crucial for preventing sun damage to your deck. Its water-resistant capabilities are notable, forming a shield around wood fibers at the cellular level, making it ideal for areas exposed to constant moisture, such as boat docks and outdoor furniture.

The product effectively guards against mildew and mold, critical for maintaining the longevity and appearance of wood structures in damp environments. One of its significant strengths is its user-friendly, water-based formula that is safe for use around pets, plants, and people, and it offers easy clean-up with soap and water. Additionally, its fast-drying nature and ability to penetrate wood deeply make it a lasting solution for many outdoor applications.

However, it may require multiple coats for optimum performance, which could be time-consuming. Also, while it is marketed as a stain and sealer in one, the color options are limited, which might not meet everyone's aesthetic preferences. Its weight (9.13 pounds) and size (12 x 12 x 12 inches) make it a bit bulky to handle. Despite these minor drawbacks, the Seal-Once Marine Premium Wood Sealer is a reliable choice for those needing a durable and environmentally friendly solution for protecting their wooden structures from the elements.

Thompson’s WaterSeal Multi-Surface Waterproofer Stain is a versatile product designed for a variety of exterior surfaces including wood, concrete, and brick. It provides excellent waterproofing capabilities, helping to protect your outdoor structures from water damage. The clear finish enhances the natural texture of the material without hiding its grain, which is ideal if you want to maintain the authentic look of your deck or patio.

The product also features advanced polymers that offer fade-resistant color, ensuring your outdoor surfaces stay vibrant and less susceptible to UV damage over time. This makes it particularly suitable for areas exposed to direct sunlight. Applying the sealer is straightforward, which can be a significant advantage for those who prefer DIY projects. It covers up to 375 square feet per gallon, making it reasonably efficient for large areas.

On the downside, while it offers good water resistance, its effectiveness in preventing mildew and mold may not be as robust as some other specialized products. Additionally, because it is a clear stain, it may require more frequent reapplication compared to tinted or colored sealers that offer added UV protection. However, its ease of use and ability to protect a variety of surfaces make it a valuable option for homeowners looking for a reliable, multi-purpose outdoor sealer.