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Product Details

Fiberglass Bottomkote Racing Bronze, formerly known as Bottomkote Classic, is a hard modified epoxy antifouling paint that can be applied over any other antifouling bottom paint type, including vinyls.

Racing Bronze dries fast, and Interlux recommends it for wood, steel, and fiberglass hulls. 42% Copper content provides solid protection against all types of fouling (including Zebra Mussels). It works well in salt, fresh, and brackish waters.

Not for use in California

Tech Specs
Drying Information 50 Degrees F59 Degrees F73 Degrees F95 Degrees F
Touch Dry (ISO)3 hours2 hours1 hour30 min
Immersion12 hours10 hours8 hours6 hours
Overcoated By Min-MaxMin-MaxMin-MaxMin-Max
Bottomkote with Irgarol6 hours-5 hours-4 hours-2 hours-
Info & Guides


BARE FIBERGLASS - (POLYESTER OR VINYLESTER): Scrub the surface thoroughly with using a stiff brush and Interlux All Purpose Boat Soap. Rinse with fresh or salt water to remove loose dirt. Flush with fresh water to remove the soap residue and allow to dry. Remove mold release wax using one of the following methods. Apply Fiberglass Surface Prep YMA601 with a maroon, 3M Scotch-BriteTM pad and scrub well. Flush with fresh water or wipe off with a clean, wet cloth ensuring that no traces of Fiberglass Surface Prep remain. An alternative method would be to dampen a cheesecloth with Interlux Fiberglass Solvent Wash 202. Wipe thoroughly to remove all surface contamination and cleaners. Wipe off with a clean, dry rag before liquid dries. To be certain the contamination has been removed, run water over the surface. If the water beads up or separates, repeat one of the above methods. When the water sheets off, all contamination has be removed. Sanding does not remove contamination. After the surface has been properly prepared follow the application system below.

Bare Fiberglass - No Sanding System: Clean surface as above. Apply one thin, continuous coat of Interlux Fiberglass No-Sand Primer with brush or roller (do not spray; do not sand). Follow application guidelines for the primer and apply Fiberglass Bottomkote with Irgarol.

Bare Fiberglass -Sanding System: Clean the surface following the preparation procedure above. Sand with 80 grade (grit) paper and remove sanding residue with Fiberglass Solvent Wash 202. Repair defects with Watertite, then sand and wipe clean. Apply Fiberglass Bottomkote with Irgarol.

BARE WOOD: Sand with 80 grade (grit) sandpaper and remove sanding residue with Special Thinner 216. Repair defects with Watertite, then sand and wipe clean. Apply first coat reduced 10% with Special Thinner 216 or Brush-Ease 433. Fill seams, if necessary, with Seam Compound Brown 30. Apply 2 further coats of Fiberglass Bottomkote with Irgarol.


In Good Condition: Wet sand surface with 80 grade (grit) paper to a clean firmly attached surface. Clean with Special Thinner 216.

In Poor Condition: Use Interstrip to remove all traces of antifouling. Sand and wipe clean with Fibreglass Solvent Wash 202 for fiberglass and wood substrates. For steel, sandblast or grind to bright metal finish.

STEEL: Contact the Interlux Technical Service Department at 1-800-468-7589 for full information on how to properly prime underwater metals.

Method Apply a minimum of 2 coats (3 on bare wood) by brush, short-nap roller or spray. To prevent premature failure, ensure correct amount of paint is applied using the coverage as a guide.

Hints Mixing Stir or shake contents thoroughly before use.

Thinner Special Thinner 216 or Brush-Ease 433.

Thinning Thin only if necessary. Thin no more than 10%. Use Brush-Ease 433 if roller or brush drags during application.

Cleaner Painted Surfaces - Special Thinner 216. Bare Fiberglass - Fiberglass Solvent Wash 202 or Fiberglass Surface Prep YMA601. Bare Wood - Special Thinner 216.

Airless Spray Tip Size: 0.53-0.66 mm/21-26 thou. Pressure: 170-204 bar/2500-3000 psi.

Conventional Spray Pressure Pot: Tip Size: 1.8-2.2 mm/70-85 thou. Pressure: 4.08-4.76 bar/60-70 psi (gun pressure); 10-15 psi (pot pressure).

Roller Use a 3/8" nap solvent resistant roller.

Other Take care to apply all the paint calculated even if it means applying an extra coat. Do not apply thin coats. Fill seams if necessary in between 1st and 2nd coats of antifouling with Underwater Seam Compound 30. Spraying of antifouling paints is prohibited in Canada.

Some Important Points Not suitable for use over aluminium/alloy substrates. Colors may fade or change above the waterline. Stir well before use. Product temperature should be minimum 10 deg C/50 deg F and maximum 29 deg C/85 deg F. Ambient temperature should be minimum 10 deg C/50 deg F and maximum 29 deg C/85 deg F. Substrate temperature should be minimum 10 deg C/50 deg F and maximum 29 deg C/85 deg F.

Compatibility/Substrates Not suitable for use over Aluminium/Alloy substrates. Suitable for fiberglass, wood and painted surfaces. Do not apply over tin-based copolymer antifouling paints. Do not use under vinyl based antifouling paints such as VC Offshore, Baltoplate or TBT based antifoulings such as Micron 33.

Number of Coats 2 coats, 3 on bare wood

Coverage (Theoretical) - 455 (sq ft/Gal)

Recommended DFT 2.0 mils dry
Recommended WFT 3.5 mils wet

Application Methods Brush, Conventional Spray, Roller, Airless Spray

Technical Information

  • Finish: Matte
  • Specific Gravity: 2.1
  • Volume Solids: 53%
  • Typical Shelf Life: 2 yrs
  • VOC (As Supplied): 440 g/lt
  • Unit Size: 1 US Quart 1 US Gallon
  • Number of Coats: 2-3 minimum, bare wood 3 coats (first thinned)
  • Coverage: (Theoretical) - 385 (ft²/Gal) by brush
  • Touch Dry Time: 50°F - 3 Hrs, 73°F - 2 Hrs, 95°F - 1 Hrs


GENERAL INFORMATION: Exposure to air and extremes of temperature should be avoided. For the full shelf life of Fiberglass Bottomkote with Irgarol to be realised ensure that between use the container is firmly closed and the temperature is between 5 deg C/40 deg F and 35 deg C/95 deg F. Keep out of direct sunlight.

TRANSPORTATION: Fiberglass Bottomkote with Irgarol should be kept in securely closed containers during transport and storage.

GENERAL: Antifoulings should only be wet sanded. Never dry sand or burn-off old antifoulings. Read the label safety section for Health and Safety Information, also available from our Technical Help Line.

DISPOSAL: Do not discard tins or pour paint into water courses, use the facilities provided. It is best to allow paints to harden before disposal.

Remainders of Fiberglass Bottomkote with Irgarol cannot be disposed of through the municipal waste route or dumped without permit. Disposal of remainders must be arranged for in consultation with the authorities.

WARNING: Cancer and Reproductive Harm -

Reviews for Interlux Fiberglass Bottomkote Racing Bronze

5 of 5 Reviews

May 14, 2021

By JD from Lake Erie

Verified Purchase

Product worked as advertised. Very competitive price

Bottom Line Yes, I would recommend to a friend

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April 26, 2017

Excellent color and performance for a classic boat...
By CommanderClub.Com from Iowa - Mississippi River

I have owned two Chris Craft Commanders (a 1968 35' and currently a 1967 42') for a total of nearly 30 years. This has been my paint of choice to maintain the originality. There are other "copper color" paints out there, but non match the brilliance of this when first applied. Performance is fantastic... I lightly sand off the scum line in spring, and then re-apply one coat to the bow, sides, and transom each year.... every 4 years, I lightly sand the entire bottom and re-apply one coat. It's an easy process, and looks fantastic.

Bottom Line Yes, I would recommend to a friend

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September 29, 2015

Great product for a wood hull.
By Loren from Hessel, Michigan

I applied two coats to my 26 ft Lyman lapstrake wood hull in 2012. It sands and applies easily. Feels thin and light for a bottom paint. It lasted three seasons with light touchups in the spring. Most durable bronze colored bottom paint I have tried. Use on Lake Huron in northern Michigan. Water is relatively cold, but gets fairly warm where moored. Classic color for a wood boat. Great product at a reasonable price.

Bottom Line Yes, I would recommend to a friend

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May 27, 2014

I will buy this product again

Verified Purchase

I refinish the bottom with two coats every year. Have wood boat on Lake of the Ozarks. Use system three for priming bear spots. Plain the boat in the fall before lay up and power wash the sides. Make prep very easy in the Spring. Bottom looks good at end of the season. this is the best bottom I have used for this purpose.

Bottom Line Yes, I would recommend to a friend

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November 10, 2009

bottomkote classic racing bronze
By bill from Nashville, Tn.

I used this product on a racing boat on a fresh water lake in Tennessee. The product is the best for racing and longivity I have ever used. It will accumulate some scum and a little aalge over the summer and needs to be rubbed off about three times a summer but is slicker and faster than anything I have used. (have owned the bost 30 years and have used it all) This has been on the boat 5 years this time and could be refreshed.

Bottom Line Yes, I would recommend to a friend

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