Pettit Ultima SR-40
Pettit Z-Spar Pettit
  • Pettit Ultima SR-40

Pettit Ultima SR-40 Dual Biocide Ablative

Pettit Ultima SR-40 is an ablative antifouling bottom paint resistant to slime, algae, barnacles and other marine fouling. Ultima SR40 has a unique dual biocide formula that combines cuprous oxide with the organic algicide Irgarol for multi-season fouling control, even in the most severe fouling areas.

Ultima SR-40 releases its 40 percent cuprous oxide via controlled erosion to ablate away spent paint to maintain fresh marine growth inhibitors on the hull surface. It also minimizes coating build up, and keeps underwater surfaces smooth and clean. Designed for hauling and re-launching without need for repainting.

$246.66 / gl
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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.


VEHICLE TYPE.....Synthetic Polymer/Rosin
COLORS.....1092 Blue, 1093 Green, 1096 Red, 1098 Black
CURING MECHANISM....Solvent Release
SOLIDS (theoretical)
By weight.....84 +or- 2 percent
By volume....54 +or- 2 percent
COVERAGE.....400 sq. ft/gal.
VOC....399 g/l max. (as supplied)
Cuprous Oxide...60 percent
N-Cyclopropyl-N1(1,1-dimethylethyl)-6- (methylthio)1,3,5-Triazine-2,4-Diamine...2 percent
FLASH POINT....98 Degrees F (SETA)


METHOD.....Brush, Roller, Airless or Conventional Spray
APPLICATION TEMP.....50 Degrees F. Minimum, 90 Degrees F. Maximum
THINNER.....120 Brushing Thinner
ASSOCIATED PRODUCTS......120 Brushing Thinner


Ultima SR-40 is heavily loaded with cuprous oxide. As a result of this loading 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. Do not thin Ultima SR-40 more than 10 percent (12 ounces per gallon) or inadequate paint film thickness will occur and premature erosion of the finish will be likely. Do not apply Ultima SR-40 in thick films or in more than four coats as poor adhesion may result.
When applying by roller use a short nap (3/16 inch maximum) roller cover.


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.


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 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.


Mix paint thoroughly to ensure toxicants are evenly dispersed throughout the can. All surfaces must be clean, dry and properly prepared prior to painting. Do not apply Ultima SR-40 on aluminum hulls or outdrives.

Previously Painted Surfaces: If the previous coating is in good condition, thoroughly sand with 80 grit paper then solvent clean with 120 Brushing Thinner to remove residue. Apply two finish coats of Ultima SR-40. If the previous coating is soft or in poor condition, remove to the bare surface by sanding or using a paint & varnish remover. Proceed with appropriate bare system as described below. Old tin copolymers should be removed or sealed with Pettit 6627 Tie Coat Primer before applying Ultima SR-40.

Bare Fiberglass: All bare fiberglass, regardless of age, should be thoroughly cleaned several times with Pettit 95 Dewaxer or 120 Brushing Thinner. Sand thoroughly with 80 grit sandpaper to a dull, frosty finish and rewash the sanded surface with 95 Fiberglass Dewaxer or 120 Brushing Thinner to remove sanding residue. Then apply two coats of Ultima SR-40, 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, wash the fiberglass three times using Pettit 95 Dewaxer only. Then apply one coat of Pettit 6999 Sandless Primer. Consult the Sandless Primer label for complete application and antifouling topcoating instructions. Apply two or three coats of Ultima 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 Ultima SR-40.

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

Bare Wood: Sand entire surface with 80 grit paper; wash clean with 120 Brushing Thinner. Apply a coat of Ultima SR-40 thinned 25 percent with 120 Brushing Thinner, allow an overnight dry, lightly sand and wipe clean. Apply two finish coats of Ultima SR-40 un-thinned.

Bare Steel: Sandblast or disc sand to a clean, bright finish and remove residue with clean, dry compressed air or a clean brush. Immediately apply two coats of Pettit 4700/4701 High Build Epoxy Primer. Read and follow carefully the instructions on the 4700/4701 Epoxy Primer label. If the surface to be painted will be prepared using hand tools such as wire wheels or sanders, clean-off residue and immediately apply one coat of Pettit 6980 Rustlok Steel Primer. Let dry 1-2 hours and follow with two coats of 4700/4701 High Build Epoxy Primer. Read and follow carefully the instructions for application and topcoating on both primer labels. Apply two or three finish coats of Ultima SR-40.

Keels - Lead: Abrade surface to bright metal; clean off residue. Apply one thin coat of 6455/044 Metal Primer; allow to dry six hours. Apply one coat of 4700/4701 High Build Epoxy Primer then, if fairing is required, apply Pettit Protect 7000/7001 Epoxy Fairing Compound. Follow with an additional coat of 4700/4701 High Build Epoxy Primer per label directions. Apply two or three finish coats of Ultima SR-40.

Keels - Steel or Cast Iron: Abrade surface to bright metal; clean off residue. Apply one coat of 6980 Rustlok Steel Primer, allowing to dry only 1-2 hours prior to overcoating. Then, if fairing is required, apply 7000/7001 Epoxy Fairing Compound followed by one coat of 4700/4701 High Build Epoxy Primer, finish with two or three coats of Ultima SR-40. Underwater Gear - Stainless Steel and Bronze: Use the same system as for lead keels.

This is a simplified system for small areas designed for good performance and easy application by the boatyard professional or do-it-yourselfer. For larger vessels or for applications where a high performance, professional system is desired, please consult your local Pettit representative or the Pettit Technical Department.


  • Slime Resistant
  • Multi-season technology
  • Ablative finish reduces coating build-up
  • Controlled release of toxicant for long-term protection
  • Contains PTFE for reduced friction
  • Excellent for fiberglass, wood & steel boats


DRY TIME at Substrate Temperature   To Recoat (hrs)  To Launch (hrs) 
90 Degrees F 
70 Degrees F  16 
50 Degrees F   12  48 
Below Water Line (yes/no): Yes
BRAND: Pettit Z-Spar
Number Of Parts: One Part
Type: Copper AF Paint
4.8 4

Great Paint


Dry Stored Boat


Punta Gorda


great bottom paint


I restored a 17' 1957 Penn Yan wooden outboard. It stays in salt water all summer. This bottom paint didn't allow one barnacle to grow over four months, despite water temperatures in the high 70s. Make sure you get the right thinner as this paint is a mess to clean up, but it goes on beautifully.

Niall the builder

Onancock, VA


Awesome service by Jamestown!


Jamestown came through with flying colors and a rapid replacement shipment after the first shipment of paint arrived damaged and spilled within the packing material. Jamestown is wonderful to work with and the second shipment arrived in good shape in time to prep the boat for launch. Will continue shopping here in the future!


Silver Spring, Maryland


Good product


A friend recommended Ultima to me last year. It worked as well as Micron Extra for less money.


NH Seacoast


Pettit Ultima SR-40 Dual Biocide Ablative



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