How to Apply Pettit Hydrocoat Application Data
The information provided here has been reproduced courtesy of Pettit Paint Company. Wholesale Marine reproduced this information 2/10/2008.
GENERAL DESCRIPTION
Hydrocoat is a waterbased antifouling bottom coating designed to give protection
against algae, barnacles and all types of marine and fresh water fouling.
Its waterbased formula results in an effective product that is easy to apply,
environmentally responsive (exceeds even the most stringent air pollution
regulations) and is safer to use. It withstands frequent trailering, beaching and
launching while offering excellent antifouling protection.
APPLICATION INFORMATION
Hydrocoat 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 more than 10% (12 ounces per gallon) or inadequate paint fi lm
thickness will occur and premature erosion of the fi nish 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 fi nish
should be done with 400-600 grit wet-or-dry paper after the coating has dried
for seven (7) days.
PHYSICAL DATA
VEHICLE TYPE…Waterbased Emulsion
COMPOSITION…40.34% Cuprous Oxide
FINISH…Flat
COLORS…1240 Blue, 1340 Green, 1640 Red, 1840 Black, 1940 Bronze
COMPONENTS…1
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)
FLASH POINT…None
APPLICATION DATA
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.
APPLICATION HUMIDITY…0% Min. / 85% Max.
DRY TIME (Hours)
To Touch To Recoat To Launch
90 F. 1/4 11⁄2 12
70F. 1⁄2 3 16
50F. 1 6 48
There is no maximum drying time before launching.
THINNER…Water or 150 Easy Brush Additive
ASSOCIATED PRODUCTS
95 Fiberglass Dewaxer
120 Brushing Thinner
4700/4701 High Build Epoxy Primer
6455/044 Metal Primer
6627 Tie Coat Primer
6980 Rustlok Primer
6999 Sandless Primer
APPLICATION NOTES
Hydrocoat is very easily applied by brush, roller or spray. When rolling, the following technique will help ensure a smoother
fi nish: 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 fi nish. 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.
SYSTEMS
Coated 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 120 Brushing Thinner, and apply Hydrocoat. Old tin or copper copolymers or Tefl on 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 overcoated directly with Hydrocoat. Traditional, soft antifoulings should be removed before applying Hydrocoat.
Fiberglass:
Wash the fiberglass with Pettit 95 Dewaxer to remove parting agents, grease and dirt. Sand thoroughly with 80
grit sandpaper to a dull, frosty finish. Rewash the sanded surface with 95 Fiberglass Dewaxer and then apply at least two
coats of Hydrocoat. To skip the tedium of sanding, wash the fi berglass twice with 95 Fiberglass Dewaxer and apply a thin
coat of Pettit 6999 Sandless Primer. Let dry in accordance with the Sandless Primer label and apply Hydrocoat. Please note
that acetone does not readily clean contaminated surfaces and its use as a cleaner/dewaxer is not recommended.
Blistered Fiberglass:
See Pettit Blister Repair Technical Sheet for detailed instruction. Wooden Hulls: 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 Polypoxy Thinner should be applied directly to the bare wood. Allow to dry 4 hours and then apply two unthinned coats of Hydrocoat per instructions. Existing, hard antifouling paint should be thoroughly sanded. If priming is necessary on bare wood spots, apply a touch-up coat of 6627 Tie- Coat Primer thinned 25% with 97 Polypoxy Thinner to
these areas. Then apply the subsequent coats of Hydrocoat.
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.
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.
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 specifi ed herein before using.