Pettit Hydrocoat SR
Pettit Z-Spar Pettit
  • Pettit Hydrocoat SR
  • Pettit Hydrocoat SR color chart

Pettit Hydrocoat SR

Hydrocoat SR is a high-performance, water-based antifouling paint that will last multiple seasons. Composite Copper Technology is combined with an organic algaecide for dependable protection against hard and soft fouling, while lowering the paint's environmental impact.

Hydrocoat SR is water-based, vs harsh solvents found in most bottom paints. Water-based bottom paints are easier to apply and clean up, with low VOC's and no heavy solvent smell. The unique formula allows unlimited dry time to launch, so you can paint in the fall or winter.

Hydrocoat SR is available in Black, Blue, and Red in Quart and Gallon sizes. Black and Blue are also available in a 2 Gallon size. Green available in Gallon only.

IN STOCK - Available for pickup
$93.02 / qt
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Tech Spec Product Info User Generated Content
Note: The chemical compound behind the highly effective anti-slime additive Irgarol was unavailable for several years. Paint manufacturers substituted additional zinc in its absence to ensure similar antifouling performance. Bottom paints containing Irgarol are once again available, and are recommended for extra protection in medium to severe fouling conditions.


Hydrocoat SR contains cuprous oxide. As a result, there is a tendency for settling to occur, especially if the paint has been on the shelf for several months. It is necessary to thoroughly mix the paint before using. If possible, shake the can of paint on a mechanical paint shaker. Before using, check the sides and bottom of the can to make sure all the pigment has been mixed in. If mixing is going to be done with a wooden paddle or an electric drill mixer, pour off half of the liquid from the top of the can into another can and then properly mix in any settled pigment; then remix the two parts together thoroughly. Adhere to all application instructions, precautions, conditions, and limitations to obtain optimum performance. Refer to individual labels and tech sheets for detailed instructions when using associated products, etc. When spraying, do not thin Hydrocoat SR more than 10% (12 ounces per gallon) or inadequate paint film thickness will occur and premature erosion of the finish will be likely.

Surface Preparation: Coating performance, in general, is proportional to the degree of surface preparation. Follow recommendations carefully, avoiding shortcuts. Inadequate preparation of surfaces will virtually assure inadequate coating performance.

Maintenance: No antifouling paint can be effective under all conditions of exposure. Man made pollution and natural occurrences can adversely affect antifouling paint performance. Extreme hot and cold water temperatures, silt, dirt, oil, brackish water and even electrolysis can ruin an antifouling paint. Therefore, we strongly suggest that the bottom of the boat be checked regularly to make sure it is clean and that no growth is occurring. Lightly scrub the bottom with a sponge or very soft brush to remove anything from the antifouling paint surface. Scrubbing is particularly important with boats that are idle for extended periods of time. The self-cleaning nature of the coating is most effective when the boat is used periodically. Burnishing of the surface to create a slicker finish should be done with 400-600 grit wet-or-dry paper after the coating has dried for seven (7) days.


Hydrocoat SR is very easily applied by brush, roller or spray. When rolling, the following technique will help ensure a smoother finish: Thin the paint approximately 5-10% with clean fresh water. Then wet the surface to be painted thoroughly with clean fresh water as well. This aids the "hold out" of the coating, resulting in a truer color and smoother finish. Slight variations in color and surface texture are not uncommon and should not be viewed with dismay. The surface quickly smoothes itself once in the water and any mottling of the color will diminish as well.

Previously Painted Surfaces: To paint old, hard antifoulings, thoroughly wipe down the surface with 120 Brushing Thinner, paying particular attention to waterline areas, then sand painted surface with 80 grit sandpaper. Wipe clean of sanding residue with water and apply Hydrocoat SR. Old tin or copper copolymers or Teflon based antifoulings should be sanded thoroughly with 80 grit sandpaper to remove the chalky outer surface, wiped clean of sanding residue, and then may be over coated directly with Hydrocoat SR. Traditional, soft antifoulings should be removed before applying Hydrocoat SR.

Bare Fiberglass: All bare fiberglass, regardless of age, should be thoroughly cleaned with 92 Bio-Blue Hull Surface Prep or de-waxed several times with Pettit D-95 Dewaxer or 120 Brushing Thinner. Sand thoroughly with 80 grit sandpaper to a dull, frosty finish and rewash the sanded surface with 120 Brushing Thinner to remove sanding residue. Then apply two or three coats of Hydrocoat SR, following application instructions. Careful observation of the above instructions will help ensure long term adhesion of this and subsequent years antifouling paint. To eliminate the sanding operation, prep the surface with 92 Bio-Blue Hull Surface Prep or wash the fiberglass three times using Pettit 95 Dewaxer only. Then apply one thin coat of Pettit 6998 Skip-Sand Primer or 6999 Sandless Primer. Use a 3/16" or less nap when applying by roller. Consult the primer label for complete application and antifouling top coating instructions. Apply two or three coats of Hydrocoat SR.

Barrier Coat: Fiberglass bottoms potentially can form osmotic blisters within the gelcoat and into the laminate. To render the bottom as water impermeable as possible, prepare the fiberglass surface as mentioned above (sanding method) then apply three coats of Pettit Protect 4700/4701 High Build Epoxy Primer per label directions. Apply two or three finish coats of Hydrocoat SR.

Blistered Fiberglass: See Pettit Technical Bulletin TB-1000 Gelcoat Blister Repair and Prevention Specification for detailed instructions.

Bare Wood: Bare wooden hulls should be sanded thoroughly with 80 grit sandpaper and wiped clean of sanding residue. A coat of 6627 Tie-Coat Primer thinned 25% with 97 Epoxy Thinner should be applied directly to the bare wood. Allow to dry 4 hours and then apply two un-thinned coats of Hydrocoat SR per instructions. Existing, hard antifouling paint should be thoroughly sanded. If priming is necessary on bare wood spots, apply a touchup coat of 6627 Tie-Coat Primer thinned 25% with 97 Epoxy Thinner to these areas. Then apply the subsequent coats of Hydrocoat SR.

Steel Hulls: To remove loose rust and scale from the metal surface, scrape, sandblast or wire brush. Solvent clean the surface to remove grease and dirt then apply one or two coats of Pettit 6980 Rustlok Primer* followed by two coats of Pettit 4700/4701 High Build Epoxy Primer. Follow with Hydrocoat SR.

Underwater Metal Parts: Abrade to clean bright metal by scraping, sandblasting or wire brushing. Solvent clean and apply one thin coat of Pettit 6455/044 Metal Primer. Let dry two hours and apply two coats of Pettit 6627 Tie Coat Primer*. Let the second coat of 6627 Tie-Coat Primer dry at least four hours and apply Hydrocoat SR.


These are simplified systems for small areas. Please consult your Pettit representative or the Pettit Technical Department for more complex, professional systems. Always read the labels or tech sheets for all products specified herein before using.

Min Dry Time (Hours):  To Touch  To Recoat  To Launch 
90°F  1/4  1-1/2  12 
70°F  1/2  16 
50°F  48 


  • VEHICLE TYPE: Water-Based Emulsion
  • FINISH: Flat
  • COLORS: 1247 Blue 1647 Red 1847 Black
  • CURING MECHANISM: Solvent Release
  • SOLIDS (theoretical): By weight...73 +/- 2% By volume...40 +/- 2%
  • COVERAGE: 430 sq. ft/gal.
  • VOC: 150 g/l max. (1.25 lbs/gal)
  • ACTIVE INGREDIENTS: Cuprous Oxide...25.25% N-Cyclopropyl-N(1,1-dimethyethyl)-6(methylthio) -1,3,5 triazine-24-diamine...2.00%


  • METHOD: Brush, roller, airless or conventional spray
  • NUMBER OF COATS: 2 minimum with additional coat at waterline recommended.
  • DRY FILM THICKNESS PER COAT: 1.5 mils (3.75 wet mils)
  • APPLICATION TEMP: 50° F. Min. / 90°F. Max.
  • THINNER: Water


BRAND: Pettit Z-Spar
Type: Copper AF Paint
3.4 5

Pettit hydrocoat sr review


Bought this product for its anti slime agent so I can't comment on how it will perform but all I know is it was a nightmare to apply.I thought that Mabey the paint was defective but it was not.The problem is it would not roll on properly.The roller would cake up almost almost instantly!I tried every nap size available but still the same results.I finally finished the job but it looked all blotchy and uneven.Next year I'll try a different brand.

Tom tom

Hampton Bays


He slimed me...


I wanted an eco-friendly product to use on my Grady White 209 Escape. I have had good results with Pettit products in the past while working at a boat rental business who used Pettit exclusively. I started by stripping the hull to bare gelcoat and applying 2 gallons of Interlux barrier coat. I then applied 1 gallon of Hydrocoat SR in several coats and then launched. I keep my boat in a slip in South Jersey for 9 months a year and use it 2-4 times per week while in the water. After 3 months, I saw a significant amount of yellowish/brown slime all over the bottom. It scrubbed off easily with a soft deck brush but I also saw blue in the water so I know that the paint was sloughing off too. The slime power washed off easily when I pulled the boat in December, but the areas under rollers were allowed to dry for a week and they had to be sanded clean. Thinking that I needed to apply more product, I put on another gallon over the next winter paying particular attention to the waterline and shearwater areas. Now 4 months into the second season, there is an even coating of the the same slime on the bottom that was present last year. It does scrub off easily, but only the areas that I can reach with a deck brush. I am happy with the low volatility and ease of clean-up of this bottom coat, but am very dissatisfied with the slime resistance.


Ocean City, NJ


follow up on previous review


This is a follow up to my previous review about applying this product. I now can report on it's performance and it was nothing short of phenomenal. For the last several years I've had to pull the boat in July to have the slime on the bottom power washed off to regain the speed and fuel economy lost because of the fouling. Even running the boat weekly to try keeping the slime from building up didn't work with the previous bottom paint. That all changed with this product. Even after not running the boat for nearly four months when pulled today there was almost no growth at all on the painted areas. The yard crew was also very impressed, asking what I had used. The said that this was a hard summer for bottom growth and couldn't believe how clean the boat was. Almost no need to powerwash. I'm hooked on Hydrocoat SR and will recommend to all my friends.




First time using, went on well


bottom paint went on well




Finally finished the bottom.


Started out to change coatings on my 29' sport cruiser. While sanding off old coating I encountered a blister. The more sanding the more blisters. Most were small, 1/4" diameter and just in the gel coat, some went deeper. I stopped counting after 30. Called the Tech Support at Jamestown Distributors for guidance. This is only the second fiberglass boat I've owned (I'm going back to wood after this)and not up on these repairs. After following the Tech Support's advice and three months of sanding and filling, I finally got to apply the Hydrocoat SR. After dealing with two part barrier paints the Hydrocoat SR was a breeze to apply. Went on easily with a roller. Clean up was easy and spills washed away quickly. If at all possible, have the Hydrocoat SR shaken at a paint or box store, it's alot cleaner than mixing with a paddle device on a drill. Now I'm just waiting to see how it handles the slime and critters in the Chesapeak Bay.

Cutter John

Woodbine, MD


Pettit Hydrocoat SR



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