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Interlux Fiberglass Bottomkote NT

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List Price: $56.99
Starting At: $49.99
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Interlux Fiberglass Bottomkote NT Antifouling Marine Paint

Don’t trust your boat with just any antifouling paint. Interlux is the industry leader in marine paints. They have been helping boaters restore and protect their boats for over a century.

Interlux Fiberglass Bottomkote NT is a universal antifouling paint that provides the benefits from both hard and ablative paints, making it useful on both power and sailboats alike. Formulated with a built-in slow polishing mechanism to avoid heavy paint layer build-up, Interlux Fiberglass Bottomkote NT will smooth and renew surfaces continuously.

This antifouling paint provides season-long protection in fresh or saltwater for fiberglass, wood, and primed metal underwater areas. It is not safe for aluminum hulls. Interlux fiberglass Bottomkote NT provides season-long protection and the fast-drying paint can have you painted and launched all in the same day.


  • Dual resin approach optimizes the benefits of hard and ablative paints.
  • Surface continuously smooths with use, providing a fast, fuel efficient coating
  • Fast drying - paint & launch on the same day
  • Universal, a cost effective choice for all power and sail boats in all waters. 


  • Finish: Matte
  • Coverage: 400 sq. ft/gal.
  • Number of Coats: 2 minimum
  • VOC: 449 g/lt - maximum
  • Pack Size: 1 US Quart, 1 US Gallon
  • Colors Available: YBB349 Red, YBB359 Green, YBB369 Blue, YBB379 Black

Associated Products:

Special Thinner 216 - For thinning or surface prep

Brush-Ease 433 - For thinning or surface prep

InterProtect 2000E - Universal primer for above & below waterline

How To Apply Fiberglass Bottomkote NT

Apply Interlux Fiberglass Bottomkote NT over existing antifouling paints provided the old coating is tightly adhered and is undamaged. Use Fiberglass Bottomkote NT on fiberglass, wood, or properly primed steel and lead. Unsuitable for use on tin-based copolymer antifouling paints. Use a minimum of 2 coats. Shake/stir paint thoroughly prior to applying. 

  • Application Methods: Roller, Brush, Airless Spray, or Conventional Spray
  • Number of Coats: 2
  • Dry Film Thickness per Coat: 2 mils (4.1 wet mils)
  • Coverage: 400 sq. ft/gal.
  • Application Temp: 50°F Min. / 95°F Max.
  • Thinner: Special Thinner 216 or Brush-Ease 433
Temp To Touch To Recoat To Launch
95°F 1/2 HR 1 HR 3 HR
75°F 1 HR 2 HR 6 HR
60°F 2 HR 4 HR 10 HR

Surface Preparation & Application

  • Previously Painted Surfaces (Good Condition)
  • Previously Painted Surfaces (Poor Condition)
    • Completely remove all old antifouling paint using Interstrip 299E for fiberglass and wood.
    • For steel, sandblast to near white metal.
    • Follow the appropriate application systems below.
  • Bare Fiberglass
    • Remove mold release wax and other contamination in order to ensure that the antifouling paint properly adheres to the substrate.
    • Remove mold release wax using either Fiberglass Surface Prep YMA601V or Fiberglass Solvent Wash 202.
    • Fill any surface imperfections with Interlux Watertite YAV135.
    • After the surface has been cleaned, follow one of the Fiberglass application systems below.
  • Bare Fiberglass - No Sanding System
    • Clean the surface with Fiberglass Surface Prep YMA601V.
    • Apply one coat of Interlux InterProtect 2000E.
  • Bare Fiberglass - Sanding System
    • Sand entire surface well with 80 grit paper until flat matte finish is obtained.
    • Remove sanding residue.
    • Apply two coats of Fiberglass Bottomkote NT allowing appropriate drying times.
  • Bare Wood
    • Sand with 80 grit paper, then remove sanding residue.
    • Apply the first coat of Fiberglass Bottomkote NT thinned 10% with Special Thinner 216 or Brush-Ease 433.
    • Fill seams with Interlux Seam Compound 30 (if necessary)/
    • Apply 2 or more coats of Fiberglass Bottomkote NT unthinned, allowing for appropriate dry times.

Application Tips

  • Thin only if necessary and do not thin more than 10%.
  • For airless spray, use tip size 0.53-0.66 mm/21-26 thou. Use pressure 170-204 bar/2500-3000 psi.
  • For conventional spray, use pressure pot tip size 1.8-2.2 mm/70-85 thou. Use pressure 4.08-4.76 bar/60-70 psi (gun pressure), 10-15 psi (pot pressure).
  • For roller application, use a 3/8" nap solvent resistant roller.

pdficon.pngClick Here to Download Interlux Fiberglass Bottomkote NT Datasheet

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Other Details

Google Product Type:
Google Custom Field 2:
Paint Type:
Ablative Antifouling
Number of Seasons:
Single Season
Antifouling Type:
Copper Based
Is Boat Trailerable:
Hull Material:
Fiberglass, Steel, Wood
Water Type:
Brackish Water, Fresh Water, Salt Water

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