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Aquagard AlumiKoat Brushable Antifouling Paint

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Aquagard AlumiKoat Brushable Antifouling Paint

Alumi-Koat is an acrylic copolymer, cuprous oxide pigmented coating formulated especially to prevent barnacles, algae, slime and other fouling organisms on vessels immersed in salt, brackish and fresh water. Non-toxic fumes, soap and water clean-up. Superior adhesion to aluminum, no barrier coat required. Controlled leach out. Paint can be applied over existing bottom paints that are clean, free of any debris, and dry. 

Maintaining your boat's painted surfaces and periodically repainting the boat is important for more than just your boat's appearance. Marine paints and finishes help protect your boat's hull, deck, and other surfaces from the harsh effects of the sun, the corrosive effects of salt water, and algae and barnacle growth. 


  • Water-based paint
  • Creates invisible barrier to stop slime build-up, barnacle & marine growth
  • For use on aluminum & other non-ferrous materials
  • Rolls on easy and fast drying
  • Soap & water clean-up
  • Scientifically formulate for superior adhesion to aluminum
  • Commercial grade
  • Ablative technology
  • Plastic containers increase shelf life
  • Tin free
  • U.S. EPA approved
  • Finish: Flat
  • Coverage: 450 sq. ft/gal
  • Number of Coats: 1-2
  • Application Method: Brush or roller

How to Apply


APPLICATION: Brush or Roller

NUMBER OF COATS: 1-2 (Additional coat at waterline)

**Aquagard Alumi-Koat is a copolymer and can benefit from 3 or 4 coats. 

Application Temp: Re-coat (hours) To Launch (hours)
50°F 24 
70°F 18
90°F 16

 **Above times are minimum

SAFETY: Antifouling dust can be a major health hazard and you should be wearing a respirator and particulate filter as well as eye and ear protection. Wear sleeves and gloves during application to keep the paint off your skin.



Painted Bottom

  • If the paint on the bottom of your boat is flaking, you should get a scraper and remove all loose flakes.
  • If the paint on the bottom of your boat is in poor condition, consider using a paint stripper and removing the old layer completely.

Remember: The adhesion of the new paint is only as good as the paint it is being applied over. Watch for signs of adhesion failure.

  • If your bottom paint is in good condition, you really only need to sand it a little with 80-grit sandpaper (you can use a finish sander or a random orbital sander), clean it up, tape it off and roll on another coat.

Bare Aluminum

  • Clean the hull surface thoroughly with de-waxing solvent and plenty of clean rags.
  • Sand the de-waxed hull lightly with 80-grit paper.
  • Wipe down the area again to remove all sanding residue.
  • Apply 190 Primer. Follow the manufacturer’s recommendations for primer application.



Mixing the Paint

Note: The antifouling in bottom paint is often heavy and will settle to the bottom of your can. Make sure you take the time and effort to properly mix your paint. If the copper isn’t evenly distributed, some areas of your hull will not be protected.

  • If you have a pain shaker, run it for at least 5 minutes to get the copper and pigment evenly distributed.
  • If you are mixing by hand, keep dredging up the copper off the bottom of the can.
  • Each time you add to your roller tray you will want to stir again to ensure consistency.

Applying the Paint

  • Fill your paint tray with paint and dip your roller. Roll the paint onto the hull using a short-nap roller cover (usually 3/8 nap).

Note: Don’t add any thinner to the bottom paint unless the manufacturer specifies otherwise. Be sure to stir the paint before refilling the paint tray.

  • By the time you work all the way around the hull, many bottom paints will be dry enough to overcoat. Check the specifications on the paint you are using. A second coat is usually recommended and will increase the life of almost any bottom paint; copolymers benefit from 3 or 4 coats.
  • No sanding or other prep is needed between coats.

CAUTION: Be sure you leave all zinc anodes unpainted. If you are installing new zincs, make sure you do not paint over their mounting locations. Good electrical contact is essential for zincs to do their job.


Information sourced from the Flexdel Corporation Aquagard Alumi-Koat Technical Data Sheet.  

California Residents: warning sign WARNING Cancer and Reproductive Harm -



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