TotalBoat Topside Primer – One-Part Marine Undercoat for Fiberglass & Wood (White, Quart)

TotalBoat Topside Primer: One-Part Marine Undercoat for Above-Waterline Surfaces

Start your topside paint project with a primed foundation that promotes adhesion, flexibility, and a consistent finish. TotalBoat Topside Primer is a premium one-part marine undercoat designed to work with 1- and 2-part polyurethane and enamel topside paints. Its high-solids formula spreads smoothly, delivering a thin, even coat that dries quickly and sands easily. This primer is ideal for decks and hulls above the waterline on wood, fiberglass, gel coat, or surfaces that have been previously painted in good condition.

With a focus on dependable performance, Topside Primer helps create a uniform base that enhances the look and longevity of your chosen topside finish, such as TotalBoat Wet Edge or TotalBoat TotalTread non-skid deck paint. The result is a surface that's ready for the topcoat, while keeping the process straightforward and efficient.

Key Benefits at a Glance

• ONE-PART MARINE PRIMER FOR BOATS: a durable, flexible undercoat compatible with both polyurethane and enamel topside paints.
• COVERS COMPLETELY IN JUST ONE COAT: a high-solids formula that seals the surface with a thin, even layer; optional second coat for higher build.
• EASY TO APPLY BY BRUSH, ROLL OR SPRAY: suitable tools include a natural bristle brush, a 1/8" foam roller, or a 1.1mm spray tip.
• DRIES FAST AND SANDS SMOOTH: typically ready to sand in 60–90 minutes at 65°F, then ready for a topside finish.
• VERSATILE SURFACE COMPATIBILITY: works on fiberglass, wood, gel coat, and surfaces in good condition that have been previously painted.
• COLOR OPTIONS AND SIZES: available in white and gray, in quart or gallon containers.

How to Use

Prepare surfaces thoroughly according to standard marine painting practices. Stir Topside Primer for a full five minutes before use to ensure proper dispersion of solids. If thinning is needed, use TotalBoat Special Brushing Thinner 100 for brushing or xylene for spraying. Apply only a thin, even coat; avoid trying to achieve full hide with a single coat. If a second coat is required, lightly sand with 220-grit sandpaper and wipe clean before applying the topcoat. For large surface imperfections, consider TotalBoat TotalFair epoxy fairing compound prior to priming.

Choose white or gray for your project and select quart or gallon sizes to fit your workload. The product is chromate-free and lead-free, designed to be user-friendly while delivering reliable performance. After priming, you can pair Topside Primer with a topside finish like Wet Edge or a non-skid deck coating such as TotalTread for a complete marine finish.

Real-Life Use Scenarios

Decks that see sun and spray often benefit from a solid primer layer that balances weather resistance with easy sanding. Hulls above the waterline primed with Topside Primer can help ensure even color and adhesion for your chosen topcoat. If you’re working on a high-widelity color match, the white or gray options give you a neutral base to hold your final shade. By setting a thin foundation, you may reduce the number of coats needed for your final topside paint while maintaining flexibility and finish quality.

Note: Always follow safety guidelines for ventilation and personal protection during application. This primer is designed to be used as an undercoat only, with the understanding that the final look and adhesion come from your chosen topcoat system.