Interlux Paint Fiberglass Bottomkote NT

Interlux Fiberglass Bottomkote NT Antifouling Bottom Paint

Interlux Fiberglass Bottomkote NT is a hybrid hard/ablative antifouling bottom paint that gives you the best of both worlds. Its dual-resin formula combines the durability of a hard coating with the self-polishing benefits of an ablative paint, so the film gradually smooths with use instead of building up heavy layers year after year. The result is a cleaner, more efficient hull and easier maintenance at haul-out.

Designed for both powerboats and sailboats, Bottomkote NT is an excellent choice for boats kept in fresh, salt, or brackish water. It delivers reliable, single-season fouling protection on fiberglass, wood, and properly primed metals hulls (not for aluminum) and can be burnished or scrubbed where extra smoothness is desired.

Available in red, green, blue, and black, it provides a classic antifouling look with modern hybrid performance.

Best Uses

Fiberglass powerboats and sailboats that are used regularly during the season

Boats kept in marinas or on a mooring in fresh, salt, and brackish water

Owners who want durable, scrubbable finish without excessive bottom paint build-up

DIYers looking for a fast-dry system that allows multiple coats and same-day launch in suitable conditions.

Key features & benefits

Hybrid hard/ablative technology - Combines hard-coat durability with a controlled polishing action to help prevent premature wear-through while still shedding light growth.

Smooth, efficient finish - As the surface slowly smooths with use, it helps reduce drag for better speed and fuel efficiency.

Fast-dry formula - Under normal conditions you can apply multiple coats and launch the same day, making it ideal for tight haul-out schedules.

Versatile application - Suitable for fiberglass, wood, and properly primed steel or lead underwater areas (not for aluminum hulls or outdrives).

Universal use - Works for most power and sailboats in fresh, salt, and brackish waters, making it a flexible choice for mixed cruising areas.

How to apply Interlux Fiberglass Bottomkote NT

Interlux Fiberglass Bottomkote NT can be applied with a brush, roller, or spray equipment over most existing antifouling paints that are in good, sound condition. Always make sure the old coating is firmly adhered, clean, and free of loose or flaking material before overcoating.

Substrates: Fiberglass, wood, and properly primed steel/lead underwater surfaces

Existing bottom paint: Check the Interlux antifouling compatibility chart to confirm suitability, then clean and sand as required

Coats: Apply at least two full coats; use an extra coat on bare wood or high-wear areas such as leading edges and the waterline

Thinning: Thin only if necessary, using the appropriate Interlux thinner, and do note exceed label recommendations

For best results, always stir or shake the paint thoroughly before and during use to keep the copper and resins evenly mixed.

Surface preparation overview

Proper prep is critical to long-term performance. Follow the detailed instructions on the product label and technical datasheet, but in general:

Previously painted surfaced - good condition

Wash to remove slime, salts, and contaminants.

Lightly sand if recommended to provide a clean, dull surface.

Removes sanding residue and apply the recommended coats of Fiberglass Bottomkote NT

Previously Painted Surfaces - poor condition

Strip loose, flaking, or heavily built-up antifouling using appropriate methods (chemical stripper for fiberglass/wood or sandblasting for steel).

Once the substrate is clean and sound, follow the bare fiberglass, bare wood, or primed metal system as directed.

Bare Fiberglass

Remove mold release wax and contaminants with the recommended Interlux fiberglass prep products.

Fair any imperfections as needed.

Follow either the no-sand or sanding system detailed in the Interlux datasheet, typically involving a suitable primer or barrier coat followed b…