Painting Advice and Premium Products from Experienced Professionals.
Marine Sealer
Waterlox Marine Sealer

$59.00 / gallon

Quantity :


Product Description
  • For exterior projects as a sealer, use 2 coats to prime, followed by 1 or 2 coats of Marine Finish.

Other Information

Waterlox Original Marine Sealer TB-3809 is a clear, medium
gloss exterior sealer, which penetrates wood enabling it
to resist moisture, dirt, common household acids,
alcoholic beverages, heat and cold.

Waterlox Original Marine Sealer is recommended for all
exterior wood surfaces as a sealer/primer to seal out
moisture and intensify adhesion of the finish coat (latex and oil-base paints, and our Marine Finish). Waterlox Original Marine Sealer is nontoxic when dry.

Preparation of Surfaces
Apply to a small test area and allow to dry prior to applying to the entire surface. Final color effect is always influenced by the grain, texture, porosity, species of wood, number of coats and by method of application.

Strip previously finished surfaces to bare wood. Where not possible to strip all wood, Waterlox Original Marine Sealer can be used as a primer/tie-coat. If the previous finish is a urethane or unknown, the finish must be abraded before application. Sand the surface well and wipe clean with a tack cloth or cloth dampened with paint thinner.


Application methods include lambswool, brush, roller, cloth, or spray. For exterior porch floors or decks, we recommend using a lambswool applicator to apply the finish. To smooth out bubbles in the surface, you can follow up with a china bristle brush. Be sure to apply the finish with the grain of the wood.

Sanding between coats is not necessary for adhesion purposes, for aesthetic reasons, you can perform a light sanding with fine sandpaper, steel wool (#4/0) or buff with a 3M® white pad.

Staining with Waterlox

Stain can be added to your first coat of Waterlox Original Marine Sealer. You can add up to 1 quart of oil-based stain to 1 gallon of Waterlox Original Marine Sealer (4:1 ratio). We recommend you use an old-fashioned oil-based stain (without additives such as urethane). Test the stain mixture as well as the subsequent coats of Waterlox Original Finishes before applying to the entire surface.

Related Products
Product Info

Waterlox Marine Advantage

One gallon of Waterlox Original Marine Sealer covers 500 square feet per gallon per coat. For harder woods such as oak, cherry, hickory and heart pine, a total of 3 coats is needed. For softer woods such as pine and Douglas fir, a total of 4 coats is needed. Thinning is not necessary.

Begin all exterior finishing projects with1-2 coats of Waterlox Original Marine Sealer, followed with 1-2 coats of Waterlox Original Marine Finish.

Dry Time

After each coat has been applied, allow to air dry for 24 hours.

Dry time depends on temperature, ventilation and humidity. For best results apply when temperatures are over 60°F, and when humidity is relatively low. Dry time will increase due to low temperatures or high humidity. Always ensure adequate ventilation.

Clean Up/Storage
Use mineral spirits or turpentine to clean tools, equipment, applicators
and spills. Then wash with warm soapy water. Transfer unused Waterlox Original Marine Sealer to smaller tightly sealed jars or raise the level in the original container by adding clean marbles or stones. This is to prevent the potential jelling of contents due to air exposure within the can.

Do not use over wax. To avoid spontaneous combustion of oil soaked rags during temporary storage, soak soiled rags and waste immediately after use in a water-filled, closed metal container.

Interior Products
Related Equipment