Seal-Once Marine 1 Gallon Penetrating Wood Sealer • Waterproofer & Stain

Overview

Seal-Once Marine delivers a penetrating, UV-stable coating designed for exterior wood that meets the demands of high-moisture environments. This water-based sealer acts as a protective partner for wood docks, decks, piers, and retaining walls, resisting saltwater spray and moisture intrusion while preserving the wood’s natural look.

How it works

The formula penetrates below the surface, bonding with wood fibers to form a flexible, breathable barrier. As it dries, it creates a shield that stays pliant with changing weather, helping reduce cracking and surface wear. Clean-up is simple with soap and water, making maintenance less of a chore after outdoor use.

Key benefits at a glance

• Water-based with ultra-low VOC for safer indoor-outdoor use and easier compliance
• UV-stable coating that helps retain color in sunny, coastal climates
• Deep penetration provides a long-lasting barrier around wood fibers
• Fast-drying film and easy soap-and-water cleanup
• Non-hazardous to pets, plants, and people when used as directed

Ideal uses and installations

Designed for outdoor furniture, thermally modified wood, and coastal installations near rivers, lakes, oceans, or ponds. It works well on boat docks, decks, piers, and retaining walls where constant moisture is a factor.

• Helps protect against water damage and salt spray while maintaining natural color
• Creates a water-resistant shield around fibers without sealing the wood too tightly

Usage notes

This marine formulation is not intended for hardwood species such as ipe, mahogany, or teak. For best results, test on a hidden area first and follow recommended application steps. The product is safe to use over open water and is non-hazardous to aquatic life when used as directed.

Real-world benefits

In coastal settings, a light, even coat can extend the life of docks and piers by reducing surface wear and moisture absorption, while still allowing the wood to breathe and age gracefully. Outdoor furniture and thermally modified wood can benefit from a translucent, color-preserving finish that enhances the wood’s natural grain.