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
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
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.
DO NOT USE THIS PRODUCT ON ALUMINUM HULLS AND OUTDRIVES.
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.