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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.
|DRY TIME at Substrate Temperature||To Recoat (hrs)||To Launch (hrs)|
|90 Degrees F||3||8|
|70 Degrees F||6||16|
|50 Degrees F||12||48|
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.