Pettit Ultima SR Ablative Bottom Paint
Pettit Z-Spar Pettit Z-Spar
  • Pettit Ultima SR Ablative Bottom Paint
  • Pettit Ultima SR Ablative Bottom Paint

Pettit Ultima SR Ablative Bottom Paint

Pettit Ultima SR Ablative Dual Biocide boat bottom paint resists slime, algae, barnacles and other marine fouling. The high cuprous oxide content combined with an organic algicide offer unprecedented control over all types of fouling, even in the most severe fouling waters. Ultima SR minimizes coating build up and keeps underwater surfaces smooth and clean by a controlled erosion process.

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Tech Spec Product Info User Generated Content


  • Slime Resistant
  • Ablative Finish Reduces Coating Build-up
  • Controlled release of toxicant for long-term protection
  • Suitable for trailered boats
  • High copper content


DRY TIME at Substrate Temperature  To Recoat  To Launch 
90 Degrees F  
70 Degrees F   16 
50 Degrees F   12  48 


VEHICLE TYPE.....Synthetic Polymer/Rosin
COLORS.....1297 Blue, 1397 Green, 1697 Red, 1897 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.....185 ACP-Thinner


Ultima SR 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 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 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 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 185 ACP-Thinner to remove residue. Apply two finish coats of Ultima SR. 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.

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, 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.

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 185 ACP-Thinner. Apply a coat of UltimaSR thinned 25 percent with 185 ACP-Thinner, allow an overnight dry, lightly sand and wipe clean. Apply two finish coats of Ultima SR unthinned.

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.

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.

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. 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.

BRAND: Pettit Z-Spar
Number Of Parts: One Part
Type: Bottom Paints
5.0 2

Excellent multiseason performance


Have used for last 8 seasons, with boat left in water all year. 2 coats have consistently lasted 2-3 seasons with only light scrubbing mid-summer. No hard growth, light slime growth.


Deltaville, Va., Lower Chesapeake Bay


Works just fine on the Chesapeake


Left boat in 2 seasons on the Chesapeake, not a bit of anything growing on hull where this paint was applied, but like a razor's edge....just above where I stopped with this paint, right at the water line, had huge barnacle growth all along the water line, stopped right where this paint began. This year, I'm raising my waterline a bit and bringing this paint up higher.Went on easy (my first time doing it too)...all I did to prep old ablative was use an 80grit drywall screen on a pad on a pole, brushed the hull to get some of the old loose stuff off, and rolled this on....couldn't have been easier.


Magothy River, Chesapeake


Pettit Ultima SR Ablative Bottom Paint



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